A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling the fluid. A bypass valve is mounted on a line to selectively bypass the fluid prior to reaching the heat exchanger. The bypass valve includes a valve poppet, a valve seat, a piston, a valve housing and a wax portion. A piston is moveable along an axis and allows movement of the valve poppet toward and away from the valve seat. The piston moves within a valve housing. A wax portion expands as a temperature increases, and causes the valve poppet to move against the valve seat. The wax portion cools if the temperature lowers such that the valve poppet moves away from the valve seat. There is a sealing surface on the valve poppet in sealing contact with the valve seat. The sealing surface is part-circular in a plane in which the axis lies. A bypass valve is also disclosed.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling the fluid. A bypass valve is mounted on a line to selectively bypass the fluid prior to reaching the heat exchanger. The bypass valve includes a valve poppet, a valve seat, a piston, a valve housing and a wax portion. A piston is moveable along an axis and allows movement of the valve poppet toward and away from the valve seat. The piston moves within a valve housing. A wax portion expands as a temperature increases, and causes the valve poppet to move against the valve seat. The wax portion cools if the temperature lowers such that the valve poppet moves away from the valve seat. There is a sealing surface on the valve poppet in sealing contact with the valve seat. The sealing surface is part-circular in a plane in which the axis lies. A bypass valve is also disclosed.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling fluid. A piston is moveable along an axis allowing movement of a valve poppet toward and away from the valve seat. The piston moves with a rigid seal carrier. The rigid seal carrier and the piston move within a valve housing. A wax element is disposed on an opposed axial side of the rigid seal carrier relative to a chamber, such that the wax element expands as a temperature of the fluid to be cooled increases, and causes the valve poppet to move against the valve seat. A bypass valve is also disclosed.

A bypass system has a source of a fluid to be cooled and a heat exchanger for selectively cooling fluid. A piston is moveable along an axis allowing movement of a valve poppet toward and away from the valve seat. The piston moves with a rigid seal carrier. The rigid seal carrier and the piston move within a valve housing. A wax element is disposed on an opposed axial side of the rigid seal carrier relative to a chamber, such that the wax element expands as a temperature of the fluid to be cooled increases, and causes the valve poppet to move against the valve seat. A bypass valve is also disclosed.

A hydraulic valve unit includes a main oil passage configured to bring a side of a master cylinder and a side of a slave cylinder to communicate with each other, and a bypass oil passage configured to bypass a valve mechanism of the main oil passage, wherein the main oil passage and a main section of the bypass oil passage are disposed to be arranged with respective axes aligned with each other, and the main section of the bypass oil passage is disposed at the same height as the main oil passage or at a position higher than that of the main oil passage in a state in which a valve body is attached at a predetermined attachment position.

A method and apparatus for a manual gas valve. The manual gas valve may include at least one internal spring and a valve plug. The internal spring may be independent from an external spring and a valve stem. The internal spring may be positioned in a constant installed height. The internal spring includes a constant spring force applied to the valve plug. The one or more manual gas valves may be used in a variety of applications.

Disclosed in the present invention is a double-spring and high-precision hysteretic pressure control valve, including an upper valve body, a lower valve body, a double-spring pressure adjustment valve, a spring energy storage linkage mechanism, and a main valve. The double-spring pressure adjustment valve includes a rough adjustment stud, a rough adjustment spring, a fine adjustment stud, a fine adjustment spring, a spring guide sleeve, and a pressure adjustment valve spool. The spring energy storage linkage mechanism includes a guide block, a valve spool control linkage, a tension spring, and a tension spring shift lever and a tension spring sliding hook. The valve spool control linkage is connected to the guide block at one end, and connected to a main valve spool drive rod via a pin at the other end. The tension spring sliding hook is mounted on the guide block, and one end of the shift lever is placed below the tension spring sliding hook so as to drive the tension spring sliding hook to move upwards, thereby controlling the state of the tension spring and enabling energy storage of the spring. The spring energy storage linkage mechanism make the valve spool to open and close momentarily at the right portion. The double-spring and high-precision hysteretic pressure control valve according to the present invention has a low cost, and can provide precise control of opening and closing pressures for the pressure control valve and control of both states of opening and closing for the main valve.

An electronic expansion valve includes a valve component and a stator component; the valve component includes a valve body assembly, a valve core, a threaded transmission assembly and a rotor; the valve body assembly is provided with a valve port, and the valve core is driven by the threaded transmission assembly to control an opening of the valve port; a wear-resistant coating is arranged on a contact surface of at least one of components having relative movement of the electronic expansion valve, the wear-resistant coating is applied by spraying, and the wear-resistant coating has a thickness of 5 to 8 microns; and the material of the wear-resistant coating includes a molybdenum disulfide material and a polytetrafluoroethylene material.

An electronic expansion valve includes a valve component and a stator component; the valve component includes a valve body assembly, a valve core, a threaded transmission assembly and a rotor; the valve body assembly is provided with a valve port, and the valve core is driven by the threaded transmission assembly to control an opening of the valve port; a wear-resistant coating is arranged on a contact surface of at least one of components having relative movement of the electronic expansion valve, the wear-resistant coating is applied by spraying, and the wear-resistant coating has a thickness of 5 to 8 microns; and the material of the wear-resistant coating includes a molybdenum disulfide material and a polytetrafluoroethylene material.

A safety faucet includes: a discharge pipe which has a hot water discharge path formed therein; a packing which moves up and down inside the discharge pipe; an operation shaft which is fixed to the packing; an upper cap which covers an upper opening of the discharge pipe, and has an upper cap through-hole formed in a center thereof to expose an upper end of the operation shaft; a lever which is rotatably coupled to the upper end of the operation shaft, and has an auxiliary operation hinge hole formed in an upper end thereof; and a safety member from which an auxiliary operation hinge shaft inserted into the auxiliary operation hinge hole is protruded, and has a cap contacting part formed in a lower end thereof to meet with an upper surface of the upper cap to form a support point.