30d02y/r Self-operated (Before-valve) Pressure Control Valves

The 30D02Y/R Self-Operated (Before-Valve) Pressure Control Valve is composed of the control valve, actuator and a spring used for pressure setting. It is suitable for controlling before- valve pressure in the pipes of non- corrosive liquids, gases and steams. When the before-valve pressure rises, the control valve is opened.

The main features are as follows:
1.It has the pressure balancing function with high sensitiity.
2.Low noise ,reliable performance, free
of maintenance
3.The standard modular design is adopted.
4.Various combined controls can be carried out through the assemblies.

Working principle
After throttling by the plug and seat, the before-valve pressure P1 of the process medium is changed into the after-valve pressure P2. Through the control pipeline, P1 is input to the upper diaphragm chamber of the actuator and acts on the top disc.
The acting force produced balances the reacting force of the spring, determining relative positions of the plug and seat and controlling the before-valve pressure. W hen the before-valve pressure P1 increases, the acting force of P1 that acts on the top disc will increase accordingly.