Abstract: A locking apparatus for a rotatable lever of the type used to control a valve. The apparatus is formed from a wedge-like base element, a wedge-like blocking element and a plurality of guide posts. The base element is fixedly attached to the valve body. The blocking element is penetrated by plural guide passages. Each guide post passes through a corresponding guide passage in the blocking element, and is threaded into the base element. A spring is interposed between the blocking element and the base element. When the spring is uncompressed, the blocking element obstructs rotation of the lever. External pressure in opposition to the spring can urge the blocking element toward the base element. When the blocking element is so positioned, the lever may be rotated.

Abstract: A unisex ball valve coupling includes an interface end that engages an interface end of a mating coupling half assembly. A valve of the coupling has a valve body, which has an open position in which fluid flow is permitted through the internal passage and a closed position in which the valve body closes off fluid flow through the internal passage. A valve shaft rotates with the valve body between the open position and the closed position. The valve shaft has a first surface. A blocking member is movable from a blocking position to a non-blocking position within the body portion. In the blocking position, the blocking member engages the first surface of the valve shaft to secure the valve body in the closed position and, in the non-blocking position, the blocking member does not engage the first surface of the valve shaft to permit opening of the valve.

Abstract: Embodiments of the invention are directed to systems and methods for automating the operation of a solenoid valve to prevent overheating of solenoid elements. The solenoid valve controls the flow of a fluid, such as gas, and may be automatically interrupted, or shut-off, of power upon the occurrence of fluctuating currents or other events. Once the problem has been removed or repaired, the flow of fluid through the solenoid valve may resume.

Abstract: A method of preventing a mass flow controller from participating in crosstalk in an array of mass flow controllers is described. The method includes sensing and providing a signal indicative of a fluid pressure inside of a mass flow controller with a pressure sensor contained within the mass flow controller, determining a response of a control valve to a rapid pressure perturbation at the inlet of the mass flow controller using the signal indicative of the fluid pressure to avoid overcompensation for the rapid pressure perturbation, and adjusting a control valve contained within the mass flow controller downstream of the pressure sensor, based on the determined response, so that the mass flow controller avoids overcompensating for the rapid pressure perturbation. The pressure sensor is positioned such that the pressure sensor is sensitive to rapid pressure perturbations at the inlet of the mass flow controller.

Abstract: The latching gas ON/OFF assembly includes a housing with a female threaded bore for receiving a male threaded neck of a gas tank cylinder having a tank valve with a pin. A bonnet is slidably connected to the housing and slides between a forward OFF position and rearward ON position. A pin depressor connected to the bonnet with a transverse latch button for locking the bonnet in the ON position and for releasing the bonnet from the ON position. When the bonnet is slid to the rearward ON position it causes the pin depressor to contact the pin of the tank valve to permit gas to flow therefrom. The latching button is spring-biased toward a locked position where a plate on the free end thereof removably resides in a complementary seat in the housing.

Abstract: The invention relates to the metering of fluids at low flow rates. More particularly, the invention provides a flow regulator for flows as low as about ½ ml per hour, provided with locking means for any set value within its range. The flow regulator comprises: an inner non-revolving core element, an outer housing, having a hollow base section and being revolvably supported co-axially with the core element, first and second chambers disposed between the core element and the outer housing, each chamber having an inlet and an outlet, the outlet of the first chamber and the inlet of the second chamber being connected by a flow restriction path, a diaphragm separating the two chambers and sealing an inlet to a discharge tube when pressure in the first chamber is higher than pressure in the second chamber, and a circular spring placed in the secondary chamber below the diaphragm and around the discharge tube.

Abstract: A device includes a stem hub attached to a fitting body. A rotatable stem is located at least partially within the stem hub. Rotation of the rotatable stem operates a blocking element located in the fitting body. In an embodiment, an upper stem is coupled to a first end portion of the rotatable stem so that rotation of the upper stem rotates the rotatable stem. A metal seal is located on the stem hub. A portion of the upper stem presses the metal seal between the upper stem and the stem hub when the upper stem is moved towards the stem hub. An operating mechanism moves the upper stem towards the stem hub and away from the stem hub. The upper stem is moved by the operating mechanism in a direction normal to the rotational axis of the rotatable stem and the upper stem.

Abstract: An actuator having a linearly movable push rod for use in automotive engineering, which may be for operating a switching element of a valve, in particular a container control valve of a commercial vehicle, having a housing having an expandable material working element and an electrical heater for heating the expandable material working element. Furthermore, a device is provided for the controlled operation of a switching element of a valve, in particular a container control valve of a commercial vehicle, which includes an actuator of the aforementioned kind.

Abstract: An apparatus is provided which prevents the removal of a companion fitting when the valve is open. Thus, for example there is disclosed a load line apparatus comprising a housing, a valve, a cam lever, or more likely a pair of cam levers, and a locking device. The housing has an interior bore, the interior bore defining a flow-through passage. The valve has a surface shaped to close the flow-through passage when the valve is closed. The cam lever is pivotally attached to the housing, and the locking device is movable by the cam lever. The cam lever is operable between a locked position and an unlocked position. In the locked position, the locking device forms a stop to prevent the valve being opened. In the unlocked position, the locking device is retracted from the locked position. The cam lever is operable from the unlocked position into the locked position only when the valve is closed. The load line apparatus disclosed prevents the valve from being opened unless the cam lever is the unlocked position.

Abstract: A hydrant coupling assembly includes a hydrant valve and a hydrant coupler, including a coupler body and a coupler actuating collar assembly having an actuating collar movable axially relative to the coupler body. The actuating collar includes at least one movable latching lug that is selectively moved into place around a mating feature on the hydrant valve adapter by lifting or lowering the actuating collar. A locking mechanism is installed within the coupler actuating collar and includes a coupler plunger, a collar plunger, a coupler plunger check ball, and a collar plunger cheek ball. The coupler plunger and the coupler plunger check ball are adapted to lock the actuating collar in a disconnected state and the collar plunger and the collar plunger check ball are adapted to lock the actuating collar in a connected state. A hydrant coupler for use in a hydrant coupling assembly is also disclosed.

Abstract: A valve locking device comprising an intermediate member (18) mountable between a valve body and valve actuator and securable to said valve body and/or actuator; a stem attachment member (20) attachable to and rotatable with a valve stem (14) and contained at least partially within said intermediate member, and an engagement member (22) movably located within said intermediate member for selective engagement with said stem attachment member; whereby in use, engagement between said engagement member and said stem attachment member prevents rotation of said stem attachment member, thus preventing rotation of said valve stem to operate the valve.

Abstract: An actuator assembly for a slit valve door is configured to maintain a slit valve in a closed condition notwithstanding a high pressure differential between adjacent chambers that the slit valve isolates from each other. The slit valve door actuator assembly includes an actuator which moves the slit valve door between open and closed positions, and a locking mechanism to keep the slit valve door in a position to seal the slit valve in resistance to high gas pressure against the slit valve door. The locking mechanism may include a hard stop which is selectively movable into position to block retracting movement of the slit valve door.

Abstract: A microvalve for controlling fluid flow, including a body portion having a plurality of spaced openings formed therein, a shutter located adjacent to and substantially parallel with the body portion having a plurality of spaced openings formed therein, a drive mechanism for causing the shutter to move laterally with respect to the body portion so that the spaced openings of the shutter are brought into and out of alignment with the spaced openings of the body portion, wherein the microvalve is in an open position and a closed position, respectively, and, a latching mechanism for preventing the shutter from moving laterally with respect to the body portion.

Abstract: A microvalve (10) for controlling fluid flow, including a body portion (14) having a plurality of spaced openings (18) formed therein, a shutter (12) located adjacent to and substantially parallel with the body portion having a plurality of spaced openings (16) formed therein, a drive mechanism (20, 22) for causing the shutter to move laterally with respect to the body portion so that the spaced openings of the shutter are brought into and out of alignment with the spaced openings of the body portion, wherein the microvalve is in an open position and a closed position, respectively, and, a latching mechanism (36, 38, 40, 42) for preventing the shutter from moving laterally with respect to the body portion.

Abstract: A hydraulic spool lock with a hydraulic spool housing, first and second hydraulic spools mounted within the hydraulic spool housing for independent selective movement with respect to the hydraulic spool housing, and a lock plunger movable mounted to the hydraulic spool housing. The present invention allows independent movement of the spools with respect to the hydraulic spool housing when the hydraulic spool lock is in the unlocked position. The present inventions prevents movement of the spools with respect to the hydraulic spool housing when the hydraulic spool lock is in a locked position.

Abstract: A pipe coupling comprises a socket having a ball valve in which a through bore having one end that allows insertion of a plug is formed and a casing supporting the ball valve for rocking motion. The casing has a slot extending from its flank to the top. The slot has a flank opening and a top opening. The flank opening is wider than the top opening. A lock element is located for movement in the through bore of the ball valve. When the one end of the through bore of the ball valve is aligned with the flank opening, the lock element advances into the flank opening, thereby preventing the ball valve from rocking. When the lock element is pushed into the through bore of the ball valve by the plug, it is disengaged from the flank opening, whereupon the ball valve is allowed to rock.

Abstract: An actuator assembly for a slit valve door is configured to maintain a slit valve in a closed condition notwithstanding a high pressure differential between adjacent chambers that the slit valve isolates from each other. The slit valve door actuator assembly includes an actuator which moves the slit valve door between open and closed positions, and a locking mechanism to keep the slit valve door in a position to seal the slit valve in resistance to high gas pressure against the slit valve door. The locking mechanism may include a hard stop which is selectively movable into position to block retracting movement of the slit valve door.

Abstract: An improved pilot guard for controlling the flow of gaseous fuel to both a pilot burner and a main burner, the pilot valve comprising a housing having an inlet port, a pilot port and a main burner port; a bore extending through the housing between the pilot port and main burner port; a stop shuttle normally biased to a seated position in which it blocks communication between the inlet port and the bore; a reset shuttle positioned in the bore for lifting the stop shuttle from its seated position, the reset shuttle supporting a sealing member for sealing the inlet port from the main burner port but permitting communication between the inlet port and the pilot port when the reset shuttle lifts the stop shuttle from its seated position; a thermocouple capable of generating a current from the heat of the pilot burner; an electromagnet connected to the thermocouple and capable, when fully energized, of holding the stop shuttle from moving to its seated position; wherein the reset shuttle is movable by the force of

Abstract: A safety device of a water faucet includes a safety bolt mounted on a water faucet to function as a secondary control of operation of the control handle and the control rod, thereby preventing the child from unintentionally touch and drive the control handle so as to protect the child, thereby greatly enhancing the safety of the water faucet.

Abstract: A combined alarm test and drain device for a fire protection sprinkler system is disclosed. The apparatus is based on a globe valve and has certain specific modifications for the purposes of draining the system and allowing for flow through a specifically sized orifice under conditions simulating the flow through a sprinkler head having the same orifice size. Fluid flow through the apparatus occurs alternatively under a first set of conditions in a system alarm test mode of operation of the apparatus, and under a second set of conditions in a system fluid drainage mode of operation of the apparatus. A combination of mechanical and hydraulic forces are utilized to control opening and closing of the valve in both the alarm test and system fluid drainage modes of operation. The mechanical force is provided by a spring and the hydraulic force is provided by a fluid pressure differential.

Abstract: An improved valve disc assembly that can be easily and conveniently disassembled and reassembled with accurate positioning of the valve disc within the through bore of the valve body. A split clamp ring is provided for securing the seat retaining ring and valve seat onto the valve body for sealing engagement with the valve disc. The shaft through which movement of the valve disc to and between open and closed positions is accomplished, also includes a detent that automatically positions the valve disc within the bore upon reassembly of the valve.

Abstract: A gate valve in which the structure is simplified and inexpensive, movement of a valve body is smooth and high in speed, a force of inclination moving the valve body is strong, and a sealing property of an opening portion can be improved. The gate valve has a valve body capable of sealing the opening portion; a valve rod to which the valve body is fixed; a roller rotatably provided on the other end portion of the valve rod; a roller receiving member having a first holding portion for holding the roller when the valve rod moves the roller straight, an inclined surface for inclining the valve rod, and a second holding portion for holding the roller when the valve rod is inclined up to a predetermined angle; a driving means for moving the roller receiving member straight; and stoppers limiting the straight movement of the valve rod at predetermined positions at which the valve body closes the opening portion. This gate valve is preferably driven by the cylinder apparatus.

Abstract: An apparatus to permit or stop the flow of water through a conduit is described as having a microprocessor which contains a real time clock, day of the week indication, and an elapsed time clock. Data relating to the quantity of water flowing at any given moment is supplied by a flowmeter to the microprocessor. Primary and subsetting information is supplied to the microprocessor to determine the maximum allowable quantity of water that may flow over a specified period of time. The subsetting parameters override the primary information if so enabled and supply replacement information for certain periods of time. The elapsed time clock is reset whenever the flow rate becomes zero (no water flowing) or when the predetermined period of time is exceeded prior to exceeding the predetermined quantity of water that is allowed to flow within that period of time. If the flow of the predetermined quantity of water is exceeded within the predetermined (allowable) time frame, a solenoid is energized.

Abstract: An automatic fluid mixing device wherein a cylindrical supporting structure supports a first number of valves angularly spaced along a first circumference, and a second number of valves angularly spaced along a second circumference concentric with and inside the first; the valves are three-way types, and present a control rod extending axially from one end; and the mixing device presents a blade type selecting device movable angularly about an axis through the center of the circumferences, and which singly engages an end portion of the control rod to move the rod axially and so open the valve.

Abstract: A safety control valve for a domestic water supply system is described. It includes a valve body having a flow passage therethrough comprising a pair of laterally spaced vertical flow channels and a top flow cavity connecting these vertical flow channels. The top ends of the spaced flow channels open into a flat bottom face of the top flow cavity, which flat face forms a valve seat. A closure flap is mounted in the top cavity and is spring biased downwardly against the flat bottom face to close the valve. A central cylindrical cavity extends vertically between the bottom of the top flow cavity and the bottom of the valve body with a thin elastic diaphragm closing the top end of the cylindrical cavity. A solenoid is mounted on the bottom of the valve body concentric with the central cylindrical cavity.

Abstract: A release mechanism for permitting the operation of a pneumatic valve includes a ring (A) extending about a cylindrical hand held housing for manual manipulation to move a blocking member (B) from beneath a depressible valve operator (D) and is provided with resilient means (C) normally biasing the blocking member (B) towards a blocking position beneath the handle (D) but which may be moved by manual manipulation of the ring against the force of resilient means (C) which automatically returns the blocking member to blocking position after the handle is moved for actuating the pneumatic valve and the like for operating the hand held mechanism.

Abstract: A timed water control valve system for use with a shower, which comprises a valve body within a housing having a water flow passage with a water inlet for a source of water and a water outlet for a device to dispense water, which water flow is to be time controlled. The valve body includes first, second and third spool passageways, with the three spools therein tensionally positioned in their respective spool passageways and adapted to move slidably between a water flow position and a non-water flow position. A timer having a rotatable shaft is connected to a knob which on rotatable movement activates the timer to a preselected water flow time period for the flow of water. The knob is also moved between an inward, water non-activated position and an outward, water activated position; first and second cams about the shaft and between the timer and knob permit the rotation of the knob.

Abstract: A nozzle structure arranged for mounting to a garden hose and the like is provided, wherein an L-shaped nozzle structure having a trigger mounted within the nozzle is provided to impart selective fluid flow through an associated outlet conduit. The trigger member is arranged for sliding and reciprocation in a parallel orientation relative to the outlet conduit structure of the invention, and wherein a lock member is arranged to secure the trigger member in operative orientation, and wherein the trigger member is operative to effect manipulation of a rotary valve to direct fluid flow from a first conduit to a second conduit.

Abstract: A safety valve locking device is disclosed and includes a collar adapted to fit over a valve rim. A slide member is provided for selectively preventing and permitting the depression of an actuator head arranged on a valve stem to actuate a valve assembly of a pressurized container. The slide member includes a leading end and a trailing end and an aperture arranged therebetween through which the valve stem extends. The slide member is movable when pressure is applied or released from the trailing end thereof, between an occluding position at which the actuator head on a valve stem is misaligned with the aperture so that the valve stem cannot be depressed downwardly therethrough and a nonoccluding position at which the actuator head is aligned with the aperture so that the valve assembly can be actuated upon depression of the valve stem.

Abstract: An apparatus wherein a coffee maker includes a brew pot formed with a conical upper chamber and a cylindrical lower chamber, wherein the cylindrical lower chamber includes a valve member cooperative with the lower chamber to selectively disrupt and discontinue flow therethrough. The valve member cooperates with a concave deflectable plate mounted therein to receive a shaft to overlie and deflect the plate to disengage flow to a lower conduit formed within the lower chamber.

Abstract: A directional control valve is provided which can be switched into one of its switching positions only after the operator has supplied an additional signal.

Abstract: A safety device for a pneumatic tool having a body and an operation lever and a valve stem lowered by the operation lever has an axially movable pivot shaft by which the operation lever is pivoted to one end of the main body of the pneumatic tool. A stop is formed on the pivot shaft so as to move between a resting position and an operating position together with the pivot shaft. A conical coil spring is provided to urge the operation lever upward by its torsional action and the stop as well as the pivot shaft toward the resting position of the stop by its compressive action. A receiving chamber is formed in the operation lever at a position where it coincides with the stop when the stop is moved to the operating position by the depressing of the pivot shaft. When, in this state, the operation lever is pushed downward to cause the stop to enter the receiving chamber, the valve stem is lowered and the operation of the pneumatic tool starts.

Abstract: An actuator shaft heat-sensitive locking apparatus is disclosed comprising a cylindrical housing having an axial bore. A shaft link is provided in the bore and is adjustable to contact gate valve actuator shafts of varying lengths. Once adjusted, the shaft link is movable axially between a first position and a second position, allowing the actuator shaft to close the gate valve. There is also provided a means movably extending through the housing for partially blocking the bore and a fusible element slidably mounted in the bore between the shaft link and the means for partially blocking the bore. The fusible element has both a solid state and a heat responsive state. In its solid state, the fusible elemnt prevents movement of the shaft link by enaging the bore blocking means; in its heat responsive state, the fusible element allows movement of the shaft link between the first position and second position.

Abstract: There is described a lock plate assembly for use with a three-position ball valve. The valve has a body, a valve element disposed for rotation within the body, and a handle mounted for rotation upon the body for operation of (off) position, a second (test) position and a third (drain) position. The lock plate assembly includes a lock plate frame defining a first frame stop for the handle in the first position and a second frame stop for the handle in the third position, a slide latch defining a latch stop for the handle in the second position, the latch stop being mounted upon the frame for movement between a first latch position with the latch stop disposed to prevent movement of the handle to the third position, and a second latch position with the latch stop removed from the path of the handle, and a spring or the like for biasing the slide latch toward the first latch position.

Abstract: A multi-stage valve having a valve housing containing an inlet port and an outlet port that communicate through means of an elongated chamber formed in the housing. An outer sealing unit is mounted in the chamber and is adapted to close in sealing contact against one of the ports. A control orifice is passed through the first sealing unit to restrict the flow through the port when the unit is sealed thereagainst. A second inner sealing unit is mounted in the chamber behind the outer unit and is arranged to close thereagainst to seal the orifice. The two units are coupled by a lost motion mechanism which permits the sealing units to close in sequence between a fully closed position, an intermediate position wherein the flow through the valve is restricted by the orifice and a fully opened position wherein the flow through the valve is unrestricted.

Abstract: A water saving device that is attached to a conventional water faucet and that includes a vertical movable actuating member for promptly closing off water flow through the device, and further includes a laterally movable member that is pressed inwardly to move a ball valve to the open position for allowing flow of water through the device wherein a preset flow of water through the device may be obtained by a simple touch of the hand.

Abstract: A flow control apparatus for use primarily in plug-type and ball-type valves provides means for continuously varying the flow rate of fluid through the valve while using the same operator that is used to control the open and closed position of the valve. The upper trunnion is integrally connected to a butterfly member and connected to the plug by a mechanical linkage comprising a latch rod and a roller latch with corresponding detents in the valve body and upper trunnion, respectively. The butterfly member controls the fluid flow with the plug in the open position in response to 90 degrees of overtravel in the same operator that controls the position of the plug.

Abstract: The control/fire damper (10) comprises a tubular shell (11) constituting a flow duct (12), a shaft (13) disposed within the flow duct (12) and carried by the shell (11), and a closing plate (14) mounted on the shaft (13), and which in the case of fire damper use continuously tends to close under the action of a spring (17). The control/fire damper (10) is provided with a clamping counterpart (15) attached to the closing plate (14) and with a clamping device (16) passing through the shell (11), which fixes the counterpart (15) steplessly in the position which is desired in each instance. The clamping device (16) consists of a clamping screw and, in fire damper use, of a member attached by fuse material to the end of the clamping screw.

Abstract: An improved flow control valve apparatus for pneumatically powered tools that include a motor and feed and retract apparatus driven by the motor. The control valve apparatus includes a main flow valve and a retract control valve each of which is controlled by the control valve to provide air to the motor, to automatically stop the feed and retract motion of the tool, and to stop the tool completely when desired.

Abstract: A reset mechanism for a vacuum-actuated lockout device that disables a flush valve to prevent flooding of a receptacle includes a solenoid coupled to a reset stem and to a vacuum relief valve built into the reset stem. The solenoid is energized to open the relief valve in a first portion of a reset stroke and is coupled to the reset stem with a lost motion connection for withdrawal of the reset stem in a second portion of the reset stroke, after relief of the vacuum. A circuit is also disclosed for remote control of the reset mechanism.

Abstract: The valve comprises a two-piece housing consisting of a body and a flat cover. The body is milled out to define a working chamber. A port extends through the body wall to communicate with the chamber; a second port extends through the cover wall. The two ports are aligned at one side of the chamber, so that the remainder of the chamber provides a storage cavity. A gate valve comprising a stem and gate is wholly contained within the chamber. The base of the stem is pivotally connected on a shaft journalled in the housing, so that the gate may be rotated or swung along an arc from the storage cavity to a blocking position across the ports. Disengageable means are provided to normally lock the gate valve in the stored position. Means are also provided to bias the gate valve to the blocking position when the locking means are disengaged. The assembly is flat and compact and is particularly adapted to fit in the crowded confines of an engine.

Abstract: A butterfly valve assembly and method of making the same are provided wherein such valve assembly has a valve body structure and a closure structure and is provided with an improved device for locking, in its closed position, a shaft assembly which is used to operate the closure structure. In accordance with another feature of the invention an improved butterfly valve and method of making same are provided wherein such butterfly valve has improved heat exchange means disposed in the outer periphery of its valve body structure for controlling the temperature thereof.

Abstract: Safety interlock for operating handle of drain valve of deep fat fryer which blocks valve-opening movement of operating handle and is movable to unblocking position and thereby shuts off fry pot burner, subsequent valve-opening movement of handle maintaining interlock in unblocking position and interlock automatically returning to handle-blocking position upon movement of handle to valve-closing position.

Abstract: An erosion resistant control valve or adjustable choke has a body with a side inlet, an end outlet and a conical valve seat in alignment with the outlet. Downstream from the valve seat are a converging passage having a smaller taper than the valve seat, a cylindrical passage and a diverging passage. A stem aligned with the seat assembly includes a plug having a tapered seal surface near its upstream end for engaging the valve seat and a converging control surface downstream therefrom with the same taper as the converging passage. The smaller end of the control surface is in the cylindrical passage when the valve is closed and in the converging passage is fully open for localizing erosion downstream from the valve seat. A bleed passage relieves pressure from within the valve before the valve bonnet can be removed. The valve can be locked in a selected control setting by a split ring engaging the stem.

Abstract: A safety gas valve with latch against non-permitted reopening has the connector of the thermoelectric power unit located on the same side of the housing as the push button of the operating rod which is born shiftable and turnable in the housing. For this purpose, besides a first lever, carrying the closure member and a latch as part of the latching mechanism and cooperating with the power unit, there is provided a second lever which is tiltable around the stationary axis of the first lever. The one end of the second lever engages the armature pin of the power unit, where the other end is positioned opposite an inclined surface of the latch and disengages the latch from the first lever which carries the closure member. In the normal operating position, a projection of the latch keeps the safety valve open. After closing the valve manually, a portion of the latch is located opposite a stationary abutment until the power unit is deenergized after cooling down the thermocouple.

Abstract: A high pressure globe and check valve mechanism according to the present invention incorporates a valve body structure having a globe valve type seat removably positioned therein. A globe type valve element is adapted for seating engagement with respect to the removable seat and is positionable within the valve body by means of a valve actuating stem. A connection element establishes a lost-motion connection between the valve element and valve stem and thus allows relative movement between the valve element and valve stem during check valve type operation. The valve stem is also positionable within the valve body structure so as to maintain the valve element in positive seated engagement with respect to the valve seat.

Abstract: A frost-proof fire hydrant of the type wherein the valve is biased to its closed position by the fluid pressure in the shoe. The fire hydrant includes improved means disposed in the bonnet and cooperating with the valve stem for maintaining the valve in the closed position in the event of decreased water pressure in the shoe.

Abstract: A valve for the control of corrosive fluids is disclosed which includes a spring returned valve spool in a valve housing, the valve being manually movable by actuation of an exteriorly accessible handle, the valve spool being connected to and movable with a pipe for dispensing, the handle being removably carried on the valve housing, the valve housing having separable portions for access to the interior, the valve spool having a central passageway communicating with the dispensing pipe and having spaced packings movable in a bore, the spool in one position having one packing positioned to permit access of fluid to the central passageway while the other packing prevents access of fluid therebeyond and protects other components associated with the valve spool.Provisions are also made for locking the spool valve to prevent unintended fluid delivery.

Abstract: A manifold mounting pairs of relief valves in side-by-side clusters having a slide-rod interlock cooperating with swing-mounted clapper discs and operationally engaging handles connected thereto for selectively isolating one valve at a time from pressure in the manifold in preparation for its removal and replacement under pressure therefrom.

Abstract: A driving device for opening and closing a valve comprises a cylindrical body, an actuating cylinder, a spindle, a piston member, a transparent plate and a stop means for controlling the rotation of the spindle. Said stop means comprises a ring gear, a spring and a stop bar having a wedge-shaped head, said wedge head having a pair of surfaces forming an included angle which is bisected by the axis of the stop bar such that rotation of the spindle by fluid pressure on the valve is prevented but manual rotation of the spindle in either direction is permitted.