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Hydraulic slow closing LLDPT Lined check valves
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Hydraulic butterfly valves for hydro turbine inlet

YFL whole set of hydraulic butterfly valves for hydro turbine inlet include hydraulic butterfly valves, expansion joint, bypass system, electric control cabinet, hydraulic power pack etc.
  • Size:

    DN500-DN3000, 20''-120''
  • Pressure:

    PN16, PN25, PN40
  • Body:

    Carbon steel WCB/ 1.0619
  • Seat:

    EPDM, Stainless steel
  • Operation:

    Hydraulic actuator
  • Disc:

    Carbon steel, Stainless steel
  • Accessories:

    Expansion joint, Bypass system, PLC, Hydraulic power pack etc.
  • Medium:

    Water, seawater, sand water
  • products details

YFL hydraulic slow closing butterfly valves are installed at inlet of hydro turbine in hydro power plants to eliminate water hammer and protect the hydro turbine. There are expansion joints connected with the butterfly valves to adjust the total face to face during installation. And there are manual ball valves and electric operated ball valves in the bypass system. The electric operated ball valves will be opened first to reduce the pressure difference, and when the pressure difference achieves the set values, the butterfly valve will be opened automatically. The hydraulic butterfly valves will be closed quickly or slowly as request, and the closing time can be adjustable. The butterfly valve can be closed fast in first stage and then be closed slowly in second stage to eliminate the water hammer. The close angel of firs stage and second stage also can be adjustable as follow:

Open Time: 10-60S for sizes ≤DN1000; 20-120S for sizes >DN1000
Slow Closing Time: 2.5-60S for sizes ≤DN1000; 6-90S for sizes >DN1000
Quick Closing Time: 1.5-15S for sizes ≤DN1000; 2.5-30S for sizes >DN1000
Close Degree: 75°±10° for quick close, 15°±10° for slow close

The hydraulic slow closing butterfly valves can be operated with counter weight or intelligent accumulator as request. All the whole process of open and close operation can be controlled by the PLC and remote control center.

Why Choose YFL?

1. Experienced in providing best solutions according to various sever working conditions to solve problems
2. Strict quality control from raw materials production, mechanical machining, pressure test to 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.

hydraulic butterfly valves for hydro power plants

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