Abstract: A pneumatic assist valve receives constant air pressure from supply air to provide the pneumatic assist to shift the pilot, eliminating false signals acting on the trip rod and the design also assures the pilot has completely shifted before diaphragm reversal occurs.

Abstract: A modular valve system in which individual valves are housed in individual, discrete, pluggable units so that they can easily be assembled. Each unit housing a valve also houses the necessary electrical circuity both to control and actuate the valves. The electrical circuit necessary to actuate a valve has its own power supply and is separate from the circuit that generates the control signal which also has its own power supply.

Abstract: Positive adjustable flow is provided for a dual flow valve for paint dispensing or the like utilizing a sliding piston and a lost motion device in combination with an adjustable stop and wherein operating lift is provided by a single pressure source alternatively applied to a plurality of operating pistons.

Abstract: A "V" shaped check stop is provided formed of spring steel or the like having a substantially greater depth than thickness to minimize frontal area in the direction of flow and further to provide for added resistance strength in the direction of flow and ease of installation in a circumferential groove on assembly.

Abstract: A pneumatic fluid flow limiting device which is pressure compensated and resets automatically when the pneumatic fluid driven device is shut off. Pressure compensation is accomplished by a vented differential diameter chamber and reset is accomplished by a bypass orifice in a spool valve which further may be variable in flow to accommodate different flow requirements for tool operation.

Abstract: Disclosed is a means for conveying air required for pneumatic malfunction around an electrical connection, in particular where space is restricted to meet International standards. The invention is shown to provide manufacturing and assembly access while minimizing the occupied cross sectional area of the available passageway space in a stacked pneumatic valve.

Abstract: The design of an air operated double diaphragm pump provides improved assembly, mounting flexibility, multiple plumbing combination including check valves which allow the pump to be mounted in any position without effecting its ability to prime or pump. A two shell housing design provides an enclosure for the air motor and includes structural ribbing, internal baffling, and all connections are made on the end of the pump in line with the diaphragm centerline allowing the pump to be installed in any access in line with the plumbing system.

Abstract: A reversible check valve cartridge wherein a sealing disk is urged to the shutoff position by means of a cage mounted umbrella spoke-like spring which is secured to the cage and is fully recessable therein so as to permit full travel of the sealing disk within the cage, thereby permitting increased flow for a given thickness of the valve cartridge.

Abstract: A double diaphragm pump subassembly, having a pair of diaphragm mounting plates, wholly confines an air valving mechanism between the plates. The mechanism is modular in nature, being substantially devoid of fasteners, and is nested in the plates for easy removal and parts replacement.

Abstract: A device for retaining a depressed reversing valve in the depressed position which is operable by the fingers or thumb of one hand to accomplish both the depressing and locking motions and the unlocking motion when it is desired to return the tool to conventional push to reverse operation. This is accomplished by a notched rotary sleeve mounted to the tool housing.

Abstract: A valve construction for dual valve automatic and manual shut-off screwdrivers and the like wherein construction of the valve features both valve elements in a central axial bore having a unique valve block which is held in place by a screw in a transverse bore, the unique construction permits operation of the manual valve by a pin in the cross bore, aligns the stem of the manual valve, and permits ready access to the stem and valve of the automatic shut-off device as well as assembly of all of the components through access in a single longitudinal bore.

Abstract: An improved torque control and fluid shut-off mechanism for a fluid operated tool includes a driving clutch member and a driven bit holder connected by ball bearings retained by the clutch member which engages in pockets in the bit holder. The pockets include a specific ramp construction which insures that the threshold torque level of the tool in the forward direction is less than the threshold level in the reverse direction.

Abstract: A bellows is comprised of a unitary body formed of relatively thin annular walls, open at one end and closed at the other. The walls are constructed and arranged as a spiral groove, whereby the bellows can be fabricated from plastic by injection molding in a relatively inexpensive fashion. The bellows can be formed of two layers joined to one another, a backup layer formed of metal or plastic and a protective layer formed of plastic such as PFA and PVDF.

Abstract: A pulsation damper for a pumped liquid system has a housing with two axially identical hollow halves which, when joined at their flanges, form a substantially cylindrical cavity. Each housing half has a port on its longitudinal axis for fluid communication with a liquid chamber and a gas chamber defined by a flexible non-porous member. A pressurizing valve is provided, in a manual embodiment, for manually increasing or decreasing pressure in the gas chamber. An automatic pressure compensator is provided in an automatic embodiment and is so sized and configured as to be insertable and removable from the housing of the pulsation damper through the port on the end of housing. Provision is also made for modularly adding volumes of air to increase the effective gas chamber volume.

Abstract: A valve assembly for fluid pressure regulation provides freedom from static pressure creep by eliminating distortions and stresses normally introduced to valve parts during assembly of the regulator. A floating valve seat permits normal installation of a valve seat housing in the regulator body with no transfer of stress or distortion to the valve seat. Thus statis pressure creep, normally attributable to micro distortions of the valve seat, is avoided. Options are also provided to install the floating valve seat directly in a regulator body without the valve seat housing.

Abstract: A fluid handling apparatus having a casing constructed of a conductive corrosion resistant plastic material formed from acetal resin impregnated with conductive stainless steel wool. When grounded through use of a convenient bonding strap, the apparatus eliminates the buildup of electrostatic charge which may occur in combustible fluid transfer.

Abstract: A fluid pressure regulator provides features which enable an extended regulator life in high pressure service. Dual flexible diaphragms provide chemical resistance in contact with the working fluid and abrasion and fatigue resistance in contact with a backup plate and piston assembly. The backup plate has a bore which is sufficiently long and close fitting with the piston so that axial alignment is assured and there is minimal tendency for the piston to become cocked within the bore. Provision is also made for preventing fretting corrosion between the piston and the backup plate by coating at least one of the surfaces, if necessary, to assure that dissimilar metals only are in contact in that couple. Seals between the regulator housing body and the diaphragm and between the valve stem and diaphragm may be provided by resilient seal rings or by annular protrusions integrally formed on one or both of the diaphragms.