Self operated pressure regulating valve

自力式压力调节阀 is an automatic control valve that does not require external energy to drive, and achieves stable pressure regulation through the pressure changes of the medium itself. It is widely used in industrial fluid control systems. The following are its core points:
1、 Working principle
Pressure regulation behind the valve
After the medium is throttled by the valve core, the pressure P2 behind the valve acts on the top plate of the actuator, balancing with the spring force to control the valve position. When P2 increases, the valve core reduces the flow rate and lowers the pressure; Otherwise, increase the traffic.
Pre valve pressure regulation
When the pressure point is the valve front pressure P1, the valve opening is controlled by balancing the spring force with P1 to maintain a constant valve front pressure.
2、 Product classification
According to the pressure measurement method
Rear valve type (pressure reducing): maintains stable downstream pressure (such as ZZYP type)
Valve front type (pressure relief): controls upstream pressure
According to the control method
Direct acting type: using diaphragm/piston to directly drive the valve core
Command operation type: By amplifying the signal through the pilot valve, the accuracy is improved
3、 Technical advantages
Energy saving and efficient: No need for electricity/gas source, reducing energy consumption
High reliability: simple mechanical structure, low failure rate
Quick response: small mechanical transmission delay when pressure changes
4、 Application scenarios
Gas system: Stable pressure of natural gas pipeline
Industrial steam: boiler steam pressure control
Chemical process: Pressure regulation of corrosive media
Typical products include ZZYP-16C steam pressure reducing valve (temperature resistance of 600 ℃) and ZZVP-16B micro pressure regulating valve (accuracy ± 5%).
Attention should be paid to the flow direction of the medium during installation, and the steam system needs to be equipped with a condenser.
ZZYP type self operated pressure regulating valve (steam pressure reducing valve) does not require external energy. It uses the energy of the regulated medium itself as a power source to introduce the actuator to control the position of the valve core, change the pressure difference and flow rate at both ends, and stabilize the pressure before (or after) the valve. It has the advantages of sensitive action, good sealing, and small pressure setting point wave power, and is widely used in automatic control of pressure reduction and stabilization or release and stabilization of gas, liquid, and steam media.
The ZZYP self operated pressure regulating valve series products include single seat (ZZYP), sleeve (ZZYM), double (ZZYN), and three structures; There are two types of actuators: membrane type and piston type; The types of action include pressure regulation after the pressure reducing valve (Type B) and pressure regulation before the pressure relief valve (Type K). The nominal pressure rating of the product includes PN16, 40, and 64; Valve body diameter range DN20-300; There are three levels of leakage: Level II, Level IV, and Level VI; The traffic characteristic is fast opening; The pressure is adjusted in stages from 15 to 2500Kpa. Can be combined as needed to meet user operating requirements.