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Hydraulic slow closing LLDPT Lined check valves
Oil & Gas

Pilot Operated Safety Valves For Long Distance Pipelines

YFL Pilot operated pressure relief valves are mainly applied in such industries as petroleum, natural gas, chemistry, electric, metallurgy and city gas for large discharge.
  • Size:

    1''-10'', DN25-DN250
  • Pressure:

    150lbs-2500lbs
  • Body:

    WCB, CF8, CF8M, CF3M
  • Test:

    API 527
  • Design standards:

    API 520, API 526
  • Temperature:

    -196℃—200℃
  • Nozzle:

    304, 316, Stellited
  • Spring:

    304, 316, 50CrVa
  • products details

YFL Pilot operated pressure relief valve is constituted by one main valve and one pilot valve. The pilot valve is activated by the change of medium pressure, and the main valve is controlled by the pilot valve.

YFL Pilot operated safety valves working principle:

When the medium is lower than the set pressure, the discs of both main valve and pilot valve are closed. The system pressure is transfered from the inlet of main valve to the chamber above the piston of main valve through the pilot supply line. The area of piston is larger than the disc selaing area, so there will be a force press the disc to make the disc closed and sealed.

When the medium pressure is higher than the set pressure, the pilot valve will be opened, the medium in the chamber above the piston will be discharged from the pilot valve. And duo to the filter in the pilot supply line, the medium under the pistion will be discharged slower. Then the pressure under the piston will be higher than the pressure above the pistion, the disc of main valve will be opened. The medium will be discharged through outlet of main valve quickly.

YFL Pilot operated safety valve advantage:

1. The set pressure can be near the working pressure. More suitable for precise control with little overpressure.


2. Discharge is not affected by back pressure and main valve inlet pressure drop


3. Main valve seat tightness increases as operating pressure rises


4. Larger discharge in short time to reduce pressure and protect pressure equipments


5. Set pressure in-line checking



Pilot operated safety valves for long distance pipeline



Why Choose YFL?

1. Experienced in providing best solutions according to various sever working conditions to solve problems
2. Strict quality control from ceramic raw materials production, ceramic parts machining to pressure test and function test
3. Professional technical support and fast response trouble shooting
4. Approved & Registered vendor of Glencore & Umicore
5. Successful cases and reference list available
6. Short delivery time, no min. order request

Testimonials from Glencore in Mining industry

"We are very happy with the results so far, and the valves seem to be top quality.
You must understand that this factory has some of the world's toughest conditions with regards to abrasive and corrosive solutions. We dissolve metals and most products and suppliers we tested in our applications failed. "  


YFL for 誉丰利 means benefiting from reputation.

We cast brand and forge reputation by quality and service.

We focus on your satisfaction and our responsibility.

Let‘s solve problems and create values for your projects.

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