Internal combustion engine valve spring, low, medium and high stress valve spring, safety valve spring, pressure reducing valve, electric regulating valve, pneumatic regulating valve, self-support regulating valve, hydraulic control valve, steam trap, gate valve, as per valve, butterfly valve, ball valve, check valve, special valve, hydraulic valve, electromagnetic valve, etc.
Relief valve: spring safety valve by using the spring force, spring loaded relief valve is closed and not closed in two kinds of structure, general inflammable, explosive or toxic medium should choose enclosed, steam or inert gases can choose not enclosed, in spring safety valve with a wrench and without a wrench, wrench mainly is to check the effect of the flexibility of the disc, sometimes also can be used as a manual emergency pressure relief.Use a spring safety valve with radiator when the temperature is higher.

Pressure reducing valve: it is by changing the orifice size, change the kinetic energy of the flow velocity and fluid, different pressure loss, so as to achieve the aim of decompression, and rely on the media itself energy control and the adjustment of the control system, make the valve after pressure fluctuations and spring force equilibrium, the valve after pressure in a certain error range constant automatic valve.
Self-regulating valve: the pressure and temperature of the medium inside the valve are used as the energy to drive the valve to work automatically.This self-acting control valve USES the feedback signal (pressure, pressure difference, temperature) at the output end of the valve to drive the disc by the actuator to change the opening of the valve, so as to adjust the pressure, flow rate and temperature.This kind of regulating valve is divided into direct action type and indirect action type.The direct acting self-actuated regulating valve is also known as the spring-loaded type, and its structure contains elastic elements such as spring, bellows, bellows type temperature package, etc., utilizing the principle of balancing elastic force and feedback signal.The indirect effect of the self-regulating valve increases a conductor (pilot valve) which amplifies the feedback signal and then drives the disc movement of the main valve through the actuator to change the valve opening.If it is a pressure self-regulating valve, the feedback signal is the valve outlet pressure, through the signal tube into the actuator.If the valve is a flow self-regulating valve, there is a orifice (or other resistance device) at the outlet of the valve and the pressure difference signal is taken out at both ends of the orifice and introduced into the actuator.If the valve is a self-regulating temperature valve, the outlet of the valve has a temperature sensor (or temperature packet) to drive the actuator through the medium of the temperature sensor.