Abstract: An attenuator dome for a ball valve includes a body defining an upstream surface and a downstream surface. The body has first and second attenuation sections. The first attenuation section has a single stage with a first plurality of passages extending from the upstream surface to the downstream surface. The second attenuation section has a first stage with a second plurality of passages extending from the upstream surface to a first plenum formed inside the body and a second stage with a third plurality of passages extending from the first plenum to the downstream surface. The single stage of the first attenuation section has first flow area percentage, the first stage of the second attenuation section has a second flow area percentage less than the first flow area percentage, and the second stage has a third flow area percentage greater than the second flow area percentage.

Abstract: An air starter for an engine, such as a turbine engine, that includes a turbine for rotatably extracting mechanical power from a flow of fluid. The turbine includes a drive shaft that can be coupled to an output shaft to provide a rotational output. The interface between the drive shaft and the output shaft can be offset.

Abstract: This disclosure relates to a valve comprising a housing, an actuating shaft and a plurality of groups of valve body elements. The plurality of groups of valve body elements are disposed in the housing and capable of rotating in the housing. The actuating shaft is configured to selectively actuate at least one group of valve body elements in the plurality of groups of valve body elements to rotate. The valve is provided with a plurality of fluid passages therein, and the actuated at least one group of valve body elements can connect or disconnect at least one of the plurality of fluid passages. The valve provided by the present disclosure can control and switch more fluid passages when an output power of an actuating device is limited.

Abstract: A regulating valve has a housing, a first valve body, a second valve body, a third valve body, a fourth valve body, and an actuating shaft. The housing has a first cavity and a second cavity. The first valve body is disposed in the first cavity. The second valve body is disposed in the first cavity, and the first valve body and the second valve body can rotate about a first axis X. The third valve body is disposed in the second cavity. The fourth valve body is disposed in the first cavity, and the third valve body and the fourth valve body can rotate about a second axis Y. The actuating shaft is rotatably disposed in the first cavity, and the actuating shaft can selectively drive one or more of the first valve body, the second valve body, the third valve body, and the fourth valve body to rotate.

Abstract: A fluid distributor valve (1) for repartitioning an inlet fluid stream (Z) into two outlet fluid streams (X, Y), comprising an inlet port (10), two outlet ports (11, 12), a first and a second valve mechanism (13, 14), one arranged upstream each outlet port (11, 12), wherein each valve mechanism (13, 14) comprises a valve body (15, 16) slidable in a cylindrical valve bore (17) in reciprocating strokes through a valve shaft (18), wherein the valve body (15, 16) includes a first portion (15a, 16a) that is formed with a progressively changing diameter so as to reduce a valve gap between the valve bore inner peripheral wall and the valve body outer peripheral wall at a plane (A, B) perpendicular to the stroke direction, in a regular operating range of the valve mechanism (13, 14), from a maximum valve gap to a minimum valve gap, to reduce or increase the flow rate through the gap towards the associated outlet port (11, 12) upon the relative movement, and wherein at least one of the valve bodies (15, 16) of the val

Abstract: An electromagnetic impact valve arrangement for a pneumatically operated field device of a processing plant, such as a chemical plant, a food-processing plant, a power plant can include an air chamber into which three air conduits lead. The three air conduits can include an air supply conduit to receive compressed air from a compressed air supply source, a control air conduit to aerate and vent a pneumatic actuator of the field device, and a venting conduit to output compressed air to a pressure sink, such as the atmosphere. The impact valve arrangement can also include a first electromagnetic impact valve (“aeration impact valve”) to open and/or close the air supply conduit and a second electromagnetic impact valve (“ventilation impact valve”) to open and/or close the venting conduit. The first impact valve and the second impact valve can be electromagnetically coupled to one another.

Abstract: A monolithic bypass includes an upstream conduit, the upstream conduit defining a first end and a second end, the upstream conduit defining an upstream bore extending from the first end to the second end, the first end defining an inlet opening to the upstream bore; a downstream conduit, the downstream conduit defining a first end and a second end, the downstream conduit defining a downstream bore extending from the first end to the second end, the first end defining an outlet opening to the downstream bore; and a bypass valve body seamlessly connected to the second end of the upstream conduit and the second end of the downstream conduit, the bypass valve body defining a bypass body bore, the upstream bore, the downstream bore, and the bypass body bore defining a seamless bypass bore extending from the inlet opening to the outlet opening; wherein the monolithic bypass is substantially U-shaped.

Abstract: A six-way directional valve (100), an outdoor unit (1000) having the same and an air conditioner are provided. The six-way directional valve (100) includes: a valve body (1), defining a valve cavity (5) therein, the valve cavity (5) having a first side wall (11) and a second side wall (12) disposed oppositely to each other, the valve body (1) being provided with a first connecting pipe (A) to a sixth connecting pipe (F); a valve spool (2), movably disposed in the valve cavity (5), a first chamber (21) being defined between the valve spool (2) and the first side wall (11), a second chamber (22) being defined between the valve spool (2) and the second side wall (12), and a third chamber (23) being defined between the valve spool (2), the first side wall (11) and the second side wall (12); and a pilot valve assembly (4).

Abstract: A decompression block assembly for coupling a source of hydraulic pressure to a hydraulically operated attachment. The assembly includes a valve body defining first and second ports that are fluidly connected to first and second couplers that are connectable to hoses of the attachment. The valve body includes a shuttle chamber having an opposed valve seats and a valve element engageable with the valve seats depending on residual pressure in fluid passages. A release member is operable to connect the shuttle valve to a drain port to discharge residual pressure in one or both fluid passages communicating with the attachment. The release member, when operated, opens a check valve in order to discharge residual pressure.

Abstract: A single coil dual solenoid valve includes: first and second moving cores having connected to respective ends thereof first and second valve bodies; first and second plunger tubes having slidably inserted thereinto the first and second moving cores, respectively; first and second stationary cores disposed at respective opposite ends of the first and second plunger tubes so as to lie opposite to the first and second moving cores, respectively; a first frame disposed to connect the first and second stationary cores; a second frame disposed to connect one end of the first and second plunger tubes, respectively; and a single solenoid disposed to enclose one of the first and second plunger tubes. By activating the solenoid, the first and second moving cores are sucked to move toward the respective first and second stationary cores, whereby the first and second valve bodies are changed over.

Abstract: The invention relates to a liquid supply system wherein liquid, such as for example, a supply of warm water, circulates. Said system consists of thick outer tubes, the inner chamber of said thick outer tubes allowing a liquid to flow through, a thin inner tube is respectively placed inside the outer tube in which the liquid can flow in the direction counter to that in the inner chamber. In the path of at least one outer tube, a first tube branch is introduced enabling the first inner tube to be withdrawn, and in said first branch, at least one functional component, such as a shut-off valve, is introduced into the inner tube and guided to a second tube branch in the path of an outer tube and extends further through said tube branch and then into the inner chamber of the latter outer tube.

Abstract: A method of isolating a section of pipe includes the steps of locating a seal unit having two seal elements in a pipe via a penetration in the pipe, such as a branch or tee. The seal unit is then positioned in the pipe downstream of the penetration. The seal elements are activated using a primary activation mechanism to engage the pipe wall and then maintained in an activated condition using a secondary activation mechanism.

Abstract: A valve for regulating the flow of fluid through an access port in a fluid chamber includes a body having a first end and a second end, the second end being located in the access port and the first end protruding outside of the access port. An axial bore extends from the first end to the second end, an injection fitting is formed at the first end of the body in fluid communication with the axial bore, and the second end of the body includes a selective sealing interface. The body forms a sealing interface with a threaded inner wall surface of the access port. A one-way valve assembly is positioned within the axial bore, and is arranged to permit a flow of fluid therethrough in a downstream direction and prevent the flow of fluid therethrough in an upstream direction. A bypass passageway extends from the selective sealing interface separate from the axial bore. A connecting passageway connects the bypass passageway with the axial bore upstream of the one-way valve assembly.

Abstract: An angle flow valve comprises a housing and a cover. The housing comprises a first recess for receiving a flow restrictor, a second recess for receiving a relief valve, a first port fluidly connected to the first recess, an angled flow path fluidly connected to the first recess and to the second recess, a second port fluidly connected to the angled flow path, and a relief passage between the first recess and the second recess. The first recess is parallel to the second recess, permitting drop-in assembly of the flow restrictor and relief valve. The cover comprises a solenoid assembly, and the cover couples to the housing by adjoining the solenoid against the flow restrictor and by adjoining the cover against the relief valve. A single o-ring seals the leak path between the cover and the housing.

Abstract: A freeze resistant sanitary hydrant is provided that employs a reservoir for storage of fluid under the frost line or in an area not prone to freezing. To evacuate this reservoir, a means for altering pressure is provided that is able to function in hydrant systems that employ a vacuum breaker.

Abstract: An example dual pump/dual bypass fuel pumping assembly may include a dual bypass valve including a first inlet port, a second inlet port, and a movable spool arranged to modulate fuel flow from the first inlet port to a first bypass port and a first discharge port and arranged to modulate fuel flow from the second inlet port to a second bypass port and a second discharge port based on a position of the movable spool; a first pump arranged to supply fuel to the first inlet port; a second pump arranged to supply fuel to the second inlet port; a supply header arranged to supply fuel to the first pump and the second pump; a bypass header fluidicly coupled to the first bypass port, the second bypass port, and the supply header; and/or a discharge header fluidicly coupled to the first discharge port and the second discharge port.

Abstract: An isolation valve includes a flow restrictor disposed in a passage and having a piston with a first orifice and a depressurization valve with a second orifice. The valve also includes a solenoid valve assembly having a coil that is selectively energized by a signal from a controller and an armature that is moveable between first and second positions to open and close the first orifice and/or the second orifice. When the coil is energized, the armature moves to the second position to allow vapor to flow through the first orifice, the depressurization valve selectively opens to allow vapor to flow through the first orifice, the second orifice, or both. The two orifices work together to provide controlled vapor flow.

Abstract: A valve assembly is disclosed for controlling fluid flow between two reservoirs. The valve assembly includes a relief valve arranged inside the housing and configured to open a first fluid flow path when the first reservoir is above a first predetermined pressure value.

Abstract: Dissolved oxygen in alcohol is efficiently removed with a simple configuration. Device for removing dissolved oxygen in alcohol has a hydrogen-occluding metal catalyst in which hydrogen is occluded, the catalyst being charged in a device. Dissolved oxygen is removed from alcohol that contains the dissolved oxygen by bringing the alcohol into contact with the hydrogen-occluding metal catalyst. A method of removing dissolved oxygen in alcohol has removing dissolved oxygen from alcohol that contains the dissolved oxygen by bringing the alcohol into contact with a hydrogen-occluding metal catalyst which occludes hydrogen.

Abstract: A vapor isolation valve includes a first chamber in fluid communication with a fuel tank and a second chamber disposed with respect to the first chamber. A diaphragm is disposed between the first and second chambers, has an orifice allowing fluid communication therebetween, and is moveable between a diaphragm open position and a diaphragm closed position. A third chamber is disposed adjacent the first chamber, relative to the diaphragm, and is in fluid communication with an exit passage. The diaphragm open position allows fluid communication between the first and third chambers, and the diaphragm closed position substantially restricts fluid communication therebetween. A pilot valve is disposed between the second and third chambers and is selectively moveable between a pilot open position configured to allow fluid communication between the second and third chambers and a pilot closed position configured to block fluid communication therebetween.

Abstract: Methods and apparatus for bypassing a positioner in an active control loop are described. An example actuator assembly includes a pneumatic actuator and a transfer station. The transfer station includes a body defining flow paths that enable fluid to flow between a supply pressure, a valve positioner, and the pneumatic actuator and between the supply pressure and the pneumatic actuator to bypass the valve positioner without disrupting a process loop including the valve positioner. The transfer station also includes a plurality of fluid flow control devices to control the fluid flow through the flow paths.

Abstract: An automatic water flow controller for a faucet includes an outlet member, a manual valve device, one or more inlet pipes supplying water to the manual valve device, a coupling tube coupled between the outlet member and the manual valve device, a solenoid valve attached to the coupling tube for controlling the water to selectively flow through the coupling tube, and an infrared ray detector attached to the outlet member for detecting an approaching of a user within a detection zone of the infrared ray detector, the infrared ray detector is electrically connected to the solenoid valve for operating the solenoid valve to control the water to selectively flow through the coupling tube.

Abstract: A system that provides for the remote control shutoff of a main supply of a utility to a structure in an unattended manner comprises a solenoid activated shutoff valve typically mounted immediately downstream of a main shutoff valve and a securable enclosure containing a remote control switch and audible alarm unit electrically connected to a power source. A manual bypass valve is provided as an override should it be required. Because the system requires electricity to operate, a general power failure will automatically shut off of the water supply. No back-up power source, such as a back-up battery, is utilized with the present system. Further, activation of the system is accomplished using a remote control to control the system from a distance.

Abstract: A fluid supply system is provided for cooling and lubricating a transmission of an automobile, which includes, but is not limited to a cooling channel for cooling the transmission and a lubrication channel for lubricating the transmission. The lubrication channel communicates with the cooling channel via a shift valve. The shift valve is adapted to provide at least a first valve status, by which the cooling channel is connected to the lubrication channel via only one first valve path, and a second valve status, by which the cooling channel is connected to the lubrication channel via at least the first valve path and by which the cooling channel is connected in addition via a second valve path to a bypass channel bypassing the lubrication channel. Since at least two different valve statuses optimized for low and high power are provided, it is possible to reduce unnecessary spin losses over the whole range of applied powers.

Abstract: A bypass valve assembly configured to provide a secondary fluid passage around a valve. The secondary fluid passage includes a regulator device that selectively restricts the fluid flow through the secondary passage. During pressure spikes, the regulator device is configured to open so as to relieve pressure in the system and prevent failure of the valve.

Abstract: A fan air modulating valve (FAMV) employs a pair of doors rotatably attached at the fan bypass air exit of a precooler. An actuator engages the doors for simultaneous rotation through a range of motion from a first closed position to a second open position, wherein trailing edges of said doors sealingly engage an exit plenum extending from the precooler in the first closed position and fan bypass air flow is modulated by positioning the doors within the range of motion between the first and second positions.

Abstract: A pressure regulation circuit delivers pressurized fluid into a generator. The circuit includes pressure regulator structure and a primary valve. The pressure regulator structure outputs pressurized fluid at a predetermined output pressure that is greater than a desired operating pressure of the generator and less than a predetermined upper alarm pressure. The primary valve is downstream from the pressure regulator structure and is selectively opened and closed by a controller based on the pressure within the generator. The controller opens the primary valve to allow the pressurized fluid outputted from the pressure regulator structure to flow into the generator upon the pressure within the generator being at or below a predetermined lower limit. The controller closes the primary valve to prevent the pressurized fluid outputted from the pressure regulator structure from flowing into the generator upon the pressure within the generator being at or above a predetermined upper limit.

Abstract: A bypass system for a transmission is disclosed. A transmission casing defines a first aperture and a second aperture. A valve assembly includes a housing defining a first port and a second port. The housing defines an inlet in fluid communication with the first port for guiding a fluid into the transmission casing and an outlet in fluid communication with the second port for guiding the fluid out of the transmission casing. The valve assembly further includes an actuation device disposed in the housing. The housing is mounted to the transmission casing such that the first port and the first aperture cooperate with each other for routing the fluid into the transmission casing directly from the valve assembly, and the second port and the second aperture cooperate with each other for routing the fluid out of the transmission casing directly into the valve assembly.

Abstract: A water supply control system for use with a fire hydrant comprises a four-way valve assembly having a first inlet port for coupling to a nozzle of the fire hydrant via a fire hose, the four-way valve assembly operable to selectively open and close the inlet and outlet ports according to an operating mode of the four-way valve assembly, a stable and sturdy platform substantially supporting the weight of the four-way valve assembly, a flexible tether strap secured to the platform at a first end and having a fastener at a second end for releasably coupling to the fire hydrant, a status indicator mounted on the four-way valve assembly operable to provide a visual indication of the operation mode of the four-way valve assembly, and a scene light mounted on the four-way assembly operable to provide high-intensity illumination.

Abstract: A bypass valve having an adjustable flow resistance for a device through which a fluid medium flows. The valve includes a seat and a body which is biased closed, and which is movable in the opening direction by a fluid medium pressure difference between the inflow and the outflow side of the valve when the pressure difference exceeds a threshold. A bypass flow path connects the inflow side to the outflow side through the seat. The bypass valve includes a screen disposed in the bypass flow path. The valve body has two different open positions that depend on the fluid medium pressure difference. The entire cross-section of the bypass flow path is covered by the screen in a first valve body open position with a lower pressure difference, and a screen-free bypass flow path cross-section is exposed in a second valve body open position with a greater pressure difference.

Abstract: A valve assembly is disclosed for controlling fluid flow between two reservoirs. The valve assembly includes a relief valve arranged inside the housing and configured to open a first fluid flow path when the first reservoir is above a first predetermined pressure value.

Abstract: The present invention relates to a connection fitting for the connection of a ring with at least one consumer to a storey or rising main branch with inlet and outlet openings (2, 4) which can be connected to the branch and an intervening merge opening (34) for the ring main which is preceded in the flow direction (S) by a cross-section constriction (16). The present invention also relates to a water pipe system with at least one storey or rising main branch to which several ring mains are connected via separation and merge openings and a cross-section constriction provided between the separation and merge openings of the assigned ring main in the branch. The object of the present invention is to specify a connection fitting which leads to improved flow characteristics in the region of the ring main assigned to the connection fitting and to provide a water pipe system which fulfills the practical requirements in an improved manner.

Abstract: A valve assembly is disclosed for controlling fluid flow between two reservoirs. The valve assembly includes a relief valve arranged inside the housing and configured to open a first fluid flow path when the first reservoir is above a first predetermined pressure value.

Abstract: A freeze resistant sanitary hydrant is provided that employs a reservoir for storage of fluid under the frost line or in an area not prone to freezing. To evacuate this reservoir, a venturi is provided that is able to function in hydrant systems that employ a vacuum breaker.

Abstract: A pressure-controlled liquid supply system uses a pump control device to switch a pump on and off in response to a pressure level in the pumped liquid. The pump control device minimizes short cycling of the pump by preventing shut off of the pump while a flow is present through the pump control device and by delaying the shut off of the pump. The pump control device also avoids a significant drop in the output pressure by creating a reduced pressure zone, which provides the switch pressure used to switch the pump off.

Abstract: A device for detecting pressure and/or temperature changes in a fluid-channel and method thereof are disclosed. The device includes a main duct with an inlet and an outlet, a branch ductwork with a first branch end branching off the main duct downwards the inlet and with a second branch end discharging into the main duct upwards the outlet, and at least one dead-end channel with a first end that branches off the branch ductwork and a second closed end. The dead-end channel is adapted to trap a gas bubble within the dead-end channel when the device is primed or filled with a liquid fluid, wherein the gas bubble changes its size or position if a change in pressure or temperature occurs in the device.

Abstract: An electronic bypass system for a water softener having a raw water inlet and a bypass outlet, having a valve assembly associated with the water softener including at least one piston and a controller in communication with the at least one piston. The at least one piston is configured for automatically controlling water flow in a conduit between the raw water inlet and the bypass outlet in response to a signal sent from the controller.

Abstract: Rotary valves are provided having an elongate spool defining coaxially aligned inlet and outlet ports for respectively receiving and discharging a fluid, and spool inlet and outlet orifices. A rotary cage assembly defines an annular cage recess and cage inlet and outlet orifices in communication with the recess and coaxially surrounds the spool for reciprocal rotations thereabout. An actuator assembly is coupled to the rotary cage assembly for moving the rotary cage assembly between open and closed positions. When in the open position the cage inlet and outlet orifices are in fluid communication with the spool inlet and outlet orifices, respectively, to allow fluid to flow from the spool inlet port to the spool outlet port by way of the annular cage recess. When in the closed position however fluid communication is blocked between at least the cage and spool outlet orifices.

Abstract: Devices for receiving fluid such as water are described. Principally (although not necessarily exclusively) designed for use as chlorinators, the devices may divert water flowing in conduits into the devices for treatment and subsequent return to the flow stream. A device may connect to a pipe without tools and require only one hole to be formed in a pipe wall.

Abstract: A valve system for use in a system including a first source of a first pressurized fluid and a second source of a second pressurized fluid includes a valve housing including a first inlet port adapted to be placed in fluid connection with the first source, a second inlet port adapted to be placed in fluid connection with the second source and an outlet port. The valve system further includes a backflow prevention system to prevent flow of the first pressurized fluid through the second inlet and to prevent flow of the second pressurized fluid through the first inlet port. The valve system is adapted to provide a fluid path between at least the first inlet port and the outlet port to enable fluid to be drawn from the outlet port to the first inlet port. Several of the valve systems of the present invention provide for flow from the first inlet port to the outlet port and concurrent flow from the second inlet port to the outlet port.

Abstract: A multi-path valve for a media width inkjet printhead, the printhead being connected to an ink source via a closed ink flow loop, the valve having a body, a first port on the body for connection to the ink source, a second port on the body for connection to the printhead, a third port on the body for connection to a bypass ink path which bypasses the printhead on the closed loop, a fourth port on the body for connection to a gas vent on the closed loop, a chamber within the body via which the first, second, third and fourth ports are able to be interconnected and a selection device for selectively establishing interconnection between the first, second, third and fourth ports to allow ink flow therebetween.

Abstract: An apparatus includes a first valve having an inlet capable of being in fluid communication with a first fluid source, an outlet capable of being in fluid communication with the inlet, and two unidirectional valves. The first valve is capable of being in a first mode in which the inlet is in fluid communication with the outlet through a first flow path, and a second mode in which the inlet is in fluid communication with the outlet through a second flow path isolated from the first flow path. The two unidirectional valves are along the second flow path.

Abstract: A system that provides for the remote control shutoff of the main water supply to a structure in an unattended manner is herein disclosed. The system comprises a solenoid activated shutoff valve typically mounted immediately downstream of a main water shutoff valve and a locking enclosure containing a remote control switch and audible alarm unit. A manual bypass valve is provided as an override should it be required. Because the system requires electricity to operate, a general power failure will automatically shut off of the water supply. Further, activation of the system is accomplished using a remote control to control the system from a distance.

Abstract: A fluid supply apparatus includes a main passage through which fluid flows, a parallel passage section, and a pressure loss adjusting mechanism. The parallel passage section includes a plurality of passages connected in parallel to the main passage. The parallel passage section includes a selector valve, which changes the number of passages through which fluid passes among the plurality of passages. The pressure loss adjusting mechanism suppresses change in the pressure loss at the parallel passage section associated with change in an operating state of the selector valve.

Abstract: Gas manifold (1) for a cooking device that includes a distributor conduit (2) of a gas flow (Q) formed by a cylindrical pipe of a certain uniform diameter (D1) fitted with a plurality of regulation taps (3), and that is provided with a manually operated emergency tap (4) at the gas inlet, with a cut-off valve (10) disposed in parallel in relation to the distributor conduit (2), in which a seal device (13) of the passage of the flow (Q) is intercalated in the interior of the conduit (2) between an inlet (8) and an outlet (9) of the emergency tap (4), as a result of which all the flow (Q) is diverted to the emergency tap (4), thereby bypassing the seal device (13). The sealing of the distributor conduit (2) is made by means of a circular disc (14) and a ring sealing gasket (15).

Abstract: A dual chamber orifice fitting, including a body with a lower chamber in fluid communication with a pipeline and a top with an upper chamber in fluid communication with the lower chamber. A valve assembly closes to hydraulically isolate the upper chamber from the lower chamber and opens to allow an orifice plate carrier to move between the chambers. When the orifice plate carrier is in the lower chamber is can be aligned with the flowbore of the pipeline. The orifice plate carrier can be removed from the fitting through the upper chamber. In some embodiments, at least one of either the upper or lower chambers has a curved cross-section including inner and outer radii, a Cassini oval or a dog-bone shape. The body and top may also have a double curved outer surface to accommodate the curved cross-section of the interior chambers.

Abstract: A method for handling an easily polymerizable substance and a device for handling an easily polymerizable substance are provided that prevent polymerization of the easily polymerizable substance in a bypass line by renewing the easily polymerizable substance retained in the bypass line of a flow control valve or flow meter installed in a line through which flows liquid containing an easily polymerizable substance. The method for handling an easily polymerizable substance renews liquid containing an easily polymerizable substance retained in the bypass line by intermittently opening and closing a bypass shutoff valve. The method for handling an easily polymerizable substance allows a portion of a liquid containing an easily polymerizable substance flowing through a line to flow through a bypass line by opening a bypass shutoff valve during handling of a liquid containing an easily polymerizable substance.

Abstract: A double valve having inlet, outlet, and exhaust ports maintains an outlet pressure below one percent of inlet pressure during a faulted state while maintaining a relatively small exhaust for reduced overall valve size. Crossover passages receive inlet pressure through main crossover poppets when the respective valve units are not in a deactuated position. When the valve units are in a deactuated position, then the crossover passages receive inlet pressure through respective bypass passages whose flow rate can be controlled independently from the size of the crossover poppets. The use of bypass passages provides particular benefits for double valves for non-press applications which have a ratio of exhaust flow coefficient to inlet flow coefficient that is less than about 2.5.

Abstract: A method is provided for controlling superheating and temperature of a compressed natural gas stream and the addition of a corrision inhibitor composition for transmission through a pipeline that includes: a. dividing a stream of natural gas discharged from a high pressure gas compressor (106) into a first portion (108) and a second portion (202); b. passing the first portion (108) of the gas from the gas compressor to a heat exchanger (112) to heat the gas to a predetermined temperature; c. passing the first portion of gas (111) exiting the heat exchanger to an aftercooler (114); d. passing the second portion (202) of natural gas discharged from the gas compressor (106) to the aftercooler (114) without passing it through the heat exchanger (112), the second portion of gas and the first portion of gas being mixed at the aftercooler inlet and cooled by the aftercooler and discharged from the aftercooler as a cooled gas stream (116) having a temperature no greater than a first temperature; e.

Abstract: Apparatus comprising: a chamber having a chamber inlet and a chamber outlet; a first inlet for receiving a first gas stream; a second inlet for receiving a second gas stream; a first outlet for outputting the first gas stream to a first vacuum pump; a second outlet for outputting the second gas stream to a second vacuum pump; a conduit network for connecting the first inlet to the first outlet and for connecting the second inlet to the second outlet such that, for each gas stream, first and second flow paths are defined between its respective inlet and outlet, the first flow path passing through the chamber inlet and the chamber outlet, and the second flow path by-passing the chamber, and means for routing the gas streams through the network such that when one gas stream flows along its first flow path, the other gas stream flows along its second flow path.