The inlet pressure P1 of the process medium is transformed into the outlet pressure P2 after through throttling by the valve core and valve seat. At the same time, P1 acts on the top plate by controlling the pipeline input to the upper diaphragm chamber of the actuator, and the generated force is balanced with the reaction force of the spring, determining the relative position of the valve core and valve seat, and controlling the pressure in front of the valve. When the inlet pressure P1 increases, the force exerted by P1 on the top plate also increases. At this point, the force of the top plate is greater than the reaction force of the spring, causing the valve core to move away from the valve seat until the force of the top plate is balanced with the reaction force of the spring. At this point, the flow area between the valve core and valve seat increases, the flow resistance decreases, and thus P1 drops to the set value. Similarly, when the outlet pressure P2  decreases, the direction of action is opposite to the above, which is the working principle of regulating the pressure behind the valve.   Main features

1. With pressure balancing function and high sensitivity
2. Low noise, reliable performance, and maintenance free
3. Adopting standard modular design
4. Multiple combination controls can be achieved through assembly components

Self operated (valve before) pressure control valve consist of control valve, an actuator, and a spring for setting pressure. Suitable for non-corrosive liquids, gases, and steam, the self-operated pressure control valve is used to control the downstream pressure in the system pipeline. When the upstream pressure rises, the control valve opens.

Actuator

Effective areas cm²	32*	80	250	630
Pressure setting ranges(MPa)	1.0-1.6 0.3-1.2	0.1-0.5 0.05-0.25	0.015-0.25 0.01-0.06	0.005-0.035
The minimum pressure difference required for normal operation of the pressure valve△P	≥0.05	≥0.04	≥0.01	≥0.005
The maximum pressure difference allowed between the upper and lower chambers(MPa)	2.0	1.25	0.4	0.15
Materials	Diaphragm Cover: zinc coating Diaphragm : EPDM or FKM with fiber reinforcement
Control pipelines and fittings	Copper pipe or steel pipe Φ10X1(mm),  Clamp connector: R1/4”

Performance

Set value deviation		±8%
Allowable leakage( under test conditions)	Hard sealing	4×0.01% for the rated capacity of the valve.
	Soft sealing	DN15-150 10bubble/min	DN65-125 20bubble/min	DN150-250 40bubble/min