Abstract: An apparatus for preventing overheat of a scroll compressor comprising: an overload preventing device for connecting or cut off a power source by a temperature and a current; a valve housing formed as a predetermined shape and fixedly coupled to the fixed scroll; a volume type valve movably inserted into the valve housing for opening and closing the discharge hole of the fixed scroll; and a valve pressurizing means located in the valve housing for increasing an input current by pushing the volume type valve and thus by blocking the discharge hole when temperature of discharge gas discharged to the discharge hole of the fixed scroll is more than a predetermined temperature. Accordingly, when a temperature of discharge gas is drastically or gradually increased and thus becomes a preset high temperature by several conditions at the time of driving the compressor, a driving of the overheated state is stopped by an immediate reaction thus to prevent a component damage.

Abstract: A fuel return valve comprises a housing and a closing unit, a first passage, which is line-connected to a fuel pump, a second passage, which is line-connected to an internal combustion engine, and a third passage, which is line-connected to the fuel tank, as well as a pressure chamber, being formed in the housing, which pressure chamber is in communication with the first passage, and, via the closing unit, with the third passage. To make a valve of this type maintenance-free and simple and inexpensive to produce, the closing unit is a piston which is guided in the housing attachment and is pressed by a spring arranged and supported in the housing attachment onto a sealing surface which is formed on the housing and surrounds the pressure chamber, and an annular chamber which is in communication with the third passage and with the space containing the spring is formed outside the sealing surface.

Abstract: A pressure regulator for use in regulating the outlet pressure of a pump for use in an engine comprises a piston member which is moveable with respect to an outlet opening under the influence of fluid pressure acting on the piston member to control the degree by which the outlet opening is obscured. The pressure regulator comprises a biasing arrangement for applying a biasing force to the piston member which opposes the pressure of fluid acting on the piston member. The biasing arrangement comprises a moveable abutment member which is cooperable with a stop member so as to vary the rate at which the displacement of the piston member varies with fluid pressure acting on the piston member. The stop member is pre-set in a fixed position relative to the regulator housing such that movement of the abutment member is terminated when the abutment member is urged into engagement with the stop member. The invention also relates to a transfer pump comprising a pressure regulator.

Abstract: In a hydraulic tensioner having a relief valve mechanism in which a spring-biased valve element is reciprocable in a bore, hitting sounds produced by collision of the relief valve element with a plug in the bore, and wear and breakage of the biasing spring, are prevented by providing an oil relief hole in a peripheral wall of the relief valve bore at a position where it is closed by the relief valve element when he relief valve element is moved by a rapid increase in oil pressure.

Abstract: The invention relates to a pressure regulating valve comprising a valve body having one or more inlet openings and one or more outlet openings for a pressurized medium, an internal cavity connecting said inlet and outlet openings and a piston which is in contact with a valve seat between inlet and outlet and is axially slidable in the cavity in the valve body against a spring, which biases the piston to a closed position, whereby the valve opens when a predetermined pressure acts on the piston. The valve body is provided with an opening at its outlet side, where the cross-section of the opening is smaller that the cross-section of the cavity and which opening is in connection with a volume limited by the piston and the lower section of the internal cavity, whereby the pressure drop across the valve dampens variations in the volume.

Abstract: A check valve with an elongated body and a hole extending from an inlet end to an outlet end. A piston assembly is mounted within the body and can include a piston, a check valve seal and a piston spring. The piston spring biases the piston to a first piston location preventing air from flowing from the inlet toward the outlet end. The check valve seal can be positioned on the piston assembly to seal against either a check valve seat or the inside diameter of the hole to restrict air flow when the piston is in the first piston location. Movement of the piston to a downstream piston location can remove the check valve seal from the check valve seat and/or from the inside diameter of the hole, allowing air to flow from the inlet end toward to outlet end.

Abstract: A check valve with an elongated body and a hole extending from an inlet end to an outlet end. A piston assembly is mounted within the body and can include a piston, a check valve seal and a piston spring. The piston spring biases the piston to a first piston location preventing air from flowing from the inlet toward the outlet end. The check valve seal can be positioned on the piston assembly to seal against either a check valve seat or the inside diameter of the hole to restrict air flow when the piston is in the first piston location. Movement of the piston to a downstream piston location can remove the check valve seal from the check valve seat and/or from the inside diameter of the hole, allowing air to flow from the inlet end toward to outlet end.

Abstract: A gap 11 between a flange 4A of a bail support member 4 and the inner circumferential surface of a sleeve member 7 functions as an orifice for restricting an oil flow downstream of a seat hole (6B). The movement of the ball support member 4 is stabilized, pressure is generated in a chamber 9 downstream of a seat hole 6B, and the override characteristics of the relief valve 1 are improved.

Abstract: A reservoir is provided for a hydraulic dampening chamber at the end of a spool valve with a snap on cap having a labyrinth or baffled fluid entry passage formed in the closed end of the cap.

Abstract: A pressure valve, particularly for a reciprocating piston pump for conveying pressure fluid in slip-controlled hydraulic brake systems, wherein the pressure valve has a valve seat body and a valve cover body with a pre-tensioning element and a valve element installed in the space formed between the valve seat body and the cover body, which is particularly economical to manufacture, easy to install and particularly safe because of the valve seat body and the valve cover body being manufactured by non-cutting process.

Abstract: In a poppet valve the guide attachment (2) of each sealing member (1) together with the spring (5) is arranged and supported in a cup-like suspension member (8) inserted in a continuous receiving bore (15) in the catcher plate (3) and is guided with its external periphery at least in part directly on the internal periphery of the suspension member (8), as a result of which the guide length of the sealing member (1) and thus the length of stroke thereof becomes independent of the thickness of the catcher plate (3). As a result, the production, assembly and storage are simplified and new fields of application for valves of this type are opened up.

Abstract: The invention relates generally to a check valve and more particularly to a check valve for a fuel passage of a prechamber assembly of an internal combustion engine comprising a carrier member, a stop member, and a ring member. The ring member is resiliently disposed between the carrier and stop members. The ring member is movable between a first position blocking fluid communication between the carrier and stop members and a second position passing fluid between the carrier and stop members. The principal use is for applications that control fluid passing between components, such as prechamber assemblies in gaseous engines.

Abstract: A pressure limiter is connected fluid-tight between a common rail having an accumulator for storing high-pressure fuel delivered from a high-pressure fuel feed pump and a relief line. In a valve body of this pressure limiter, a damper chamber is provided on the downstream side of the sliding bore, for housing a large diameter portion of the piston and holding fuel, to thereby control the downward speed of the ball valve and the piston when the ball valve and the piston are shifted to the valve closing side by the force of the spring. Thus it becomes possible to prolong the downward-moving time of the ball valve and the piston.

Abstract: A relief valve having a cylindrical case with one side thereof communicated with a fluid-pressure source, a relief piston accommodated in the cylindrical case and slidable therein, a return spring for pressing the relief piston against the fluid-pressure source, a damper chamber provided on a rear-surface side of the relief piston, said damper chamber communicated with the fluid-pressure source through an orifice of the relief piston and used for displaying a buffer action against an operation of the relief piston, and a relief hole bored through a wall of the cylindrical case, the relief hole communicated with the fluid-pressure source when the relief piston retreats due to an increase in pressure generated by the fluid-pressure source.

Abstract: A check valve is provided for stopping the reverse flow of fluid through a fluid-carrying conduit and includes a fluid dampening device to dampen the closing movement of the valve upon flow reversal. The fluid dampening device includes a member for containing a fluid that becomes compressed upon a reverse flow of fluid through a conduit that houses the check valve. As the check valve is forced by a reverse fluid flow in a reverse direction, fluid in the fluid dampening device becomes compressed and is permitted to slowly seep out of the fluid dampening device via fluid passageways that permit only the slow escape of fluid from a compressed fluid chamber.

Abstract: The pressure regulating valve (2) proposed here can be designed with the aid of the outflow throttle restriction (28) downstream of the valve seat (22) in such a way that the pressure regulating valve (2), as the fluid flow becomes greater, sets or adjusts a smaller pressure difference at the pressure regulating valve (2), as a result of which the line losses that can never be avoided can be compensated for. The pressure regulating valve is suitable in particular for a fuel supply system of a motor vehicle having an internal combustion engine.

Abstract: A variable capacity type compressor has a swash plate, pistons reciprocating in the cylinder bores, a suction chamber, and a discharge chamber. A check valve arranged in the compressor. The check valve has a valve seat member having a flow passage and a valve seat, a case attached to the valve seat member, and a valve element arranged in the case for cooperation with the valve seat. The case has a communication hole formed therethrough to allow the gas to flow from the flow passage through the communication hole to the outside circuit. The case has a damper chamber formed therein on the back side of the valve element to damp vibration of the valve element.