Abstract: An assembly to retro-fit a valve head of a compressor that may include a valve head including an exhaust orifice, a concentric two-way valve carried by the valve head, and a valve clamp having an intake port in a top of the valve clamp; the valve clamp being removably coupled to the valve head. The valve clamp may include an annular first wall that defines an intake chamber in fluid connection with the intake port and an annular second wall outside the first wall. The space between the first and second walls may define an exhaust chamber in fluid connection with the exhaust orifice of the valve head. The valve clamp may also include a plunger housing to engage and displace a spring-loaded plunger. The plunger housing may be supported on the valve clamp with a plurality of support arms.

Abstract: An oil supply system may include a first hydraulic pump pumping oil to a low pressure portion through a first main line, a second hydraulic pump pumping oil to a high pressure portion through a second main line, first and second check valves that are respectively disposed at one side of the first and second main lines, a first convert valve supply the oil flowing the second main line to the low pressure portion depending on the pressure of oil that is transferred from a front side of the first check valve of the first main line, and a second convert valve supplying oil flowing the first main line to the high pressure portion depending on the pressure of oil that is transferred from a front side of the second check valve of the second main line.

Abstract: An air pump has a main frame, a first pressure cylinder, a second pressure cylinder, an outlet device, a footboard, and a pressure relief device. The outlet device is connected to and communicates with the pressure cylinders. The footboard is pivotally connected to the main frame, is securely connected to the pressure cylinders, and has two side panels and a limiting board. The pressure relief device is mounted on the outlet device near the first pressure cylinder and has a base, a ball, an adjusting rod, and an anti-slip-off element. The base is securely mounted on the side face of the outlet device that faces the limiting board, and has a leaking channel. A length of the adjusting rod that extends into the leaking channel of the base is longer than a distance that is defined between the limiting board and the anti-slip-off element.

Abstract: To implement a very compact cylinder head having an integrated unloader, it is provided that a unloader ring 20 having a plurality of unloader fingers 21 passing through the intake channels 16 of the intake valve 5 is arranged in the ring-shaped intake chamber 11 such that the unloader ring 20 is guided on the wall 24, 31 of the intake chamber 11, where it is arranged displaceably by means of the circumferential surface 23 of the unloader ring 20 on the outside radially or by the circumferential surface 30 of the unloader ring 20 on the inside radially; a radial step 25 is provided on the circumferential surface 23 of the unloader ring on the outside radially or on the circumferential surface 30 of the unloader ring 20 on the inside radially, and a control chamber 26 is formed between the wall 24, 31 of the intake chamber 11 and the radial step 25, this control chamber being connected to a control line 27 for supplying a control medium into the control chamber 26 and a lower stop (32) for the unloader ring (2

Abstract: An oil pressure relief valve for use in the oil pump lubrication system of an internal combustion engine is controlled by both oil pump outlet pressure and by pilot pressure from a pilot valve which is selectively applied by a control member, preferably a two-way valve that is operated by the engine control module. The pilot valve selectively supplies one of the oil pump outlet pressure or the engine gallery pressure to the control member which selectively supplies pilot valve pressure to the oil pump pressure relief valve which has a single piston. The pilot valve includes first and second pistons for selectively controlling back pressure from the pressure relief valve and for managing changes in oil pressure due to changes in the engine gallery to maintain a virtually constant pressure even as oil pump speed increases when the control member connects the pilot valve to the pressure relief valve resulting in a fuel economy benefit and improved control of the oil pump pressure.

Abstract: A valve for a pump arrangement which serves on one hand as a one-way outlet valve subject to functioning, after fluid has been dispensed, of drawing back some fluid which has been dispensed.

Abstract: Apparatus comprising a flow carrier connectable in a liquid flow system including an electric motor-pump unit and a conduit for conveying a pumped liquid to a liquid utilization apparatus. The flow carrier is connectable in the conduit and includes an opening which exposes the liquid flowing through the carrier. A heat sink or cold plate is located on the carrier over the opening, the heat sink covering the opening and having a wet side exposed to the liquid. The heat sink further includes a dry side, and heat generating electrical control components are secured to the dry side. A sensor is also mounted on the heat sink and responds to a characteristic, such as the pressure, of the liquid. A heat insulating layer extends around the control components and the sensor and covers the dry side of the heat sink, the layer preventing condensation. The sensor and the control components are operable to control the motor-pump unit.

Abstract: A monitoring device for a chemical reagent supply system includes a position voltage generator, mounted to a pump of the supply system, to monitor the expansion state of a bellows. The actual outflow of the chemical reagent is calculated by the position voltage generator. According to a demand signal from equipment needing the chemical reagent, which is processed to consider the viscosity of the chemical reagent, a theoretic demand outflow is calculated by the monitoring device. When the difference between the actual outflow and the theoretic demand outflow exceeds a permissible tolerance, the monitoring device raises an alarm signal to warn an operator and thereby to assure the accuracy of the chemical reagent supply system.

Abstract: A reciprocating compressor includes a piston reciprocating in a chamber. A valve plate disposed at one end of the chamber includes a fluid inlet orifice and a fluid discharge orifice. Each orifice is covered by a valve in the form of a resilient material check valve arranged so that a free end thereof covers the respective orifice. Each valve comprises a resilient material check valve anchored at an end opposite its free end. Each valve includes a cut-out forming a resilient portion pressed against the valve plate for pre-biasing the valve to an open position.

Abstract: The invention relates to a valve-controlled positive displacement pump having valve triggering, which permits the forced opening or keeping open of an inlet valve, operating in the manner of a non-return valve, of a displacer working space, so that the displacer working space remains connected to the inlet side of the unit even during the working stroke of the displacer, and the assigned displacer is not able to work efficiently. The design according to the invention is particularly suitable for radial piston pumps.

Abstract: A lifting device for controlling the movement of the closure plate of a compressor valve comprises a first gripper part which is connected to the compressor valve to be movable toward and away therefrom; a regulating spring which is in contact with the first gripper part to bias it toward the compressor valve; and a second gripper part which is movable with respect to the first gripper part and the compressor valve, the second gripper part including lift elements having lifting prongs which can contact the closure plate, tension screws which connect the lift elements to the first gripper part and provide end stops for the movement of the lift elements, and damper springs which damp the relative movement of the lift elements relative to the first gripper part.

Abstract: A fluid pump having a chamber, a diaphragm cooperating with the chamber and actuated by a solenoid, and inlet and outlet check valves communicating with the chamber. Another valve communicating with the chamber and interposed in the flow path of fluid through the pump between the check valves prevents the flow of fluid from the chamber to the exterior of the pump when the diaphragm is not operating while permitting fluid to be admitted to the chamber on an intake stroke of the diaphragm and to be displaced from the chamber on a discharge stroke of the diaphragm when the diaphragm is operating. An adjustable stop permits the length of the intake and discharge strokes of the diaphragm to be adjusted so that the volume of fluid displaced from the pump per each cycle of the diaphragm may be varied and adjusted within predetermined limits.

Abstract: A piston pump includes a fluid flow control system positioned between the fluid intake duct and the intake aperture of the piston cylinder, the control system including a cylindrical sleeve which is in fluid communication with the intake duct, a valve piston movable in the cylindrical sleeve, a valve stem connected to the intake valve in the piston cylinder extending through both the intake aperture and the valve piston, a first spring positioned between the valve piston and the piston cylinder, a second spring positioned between the piston cylinder and the end of the valve stem, and a fluid by-pass control device for regulating the amount of fluid passing from the intake duct around the valve piston to the intake aperture.