Wrench length for butterfly valve 2

[kpm21443]

Dear Friends,

Please advise how can we determine the length of wrench for wrench operated butterfly valve 4 & 6 inches. It is class 150, short wafer, flangeless butterfly valve. Is there any standard which specifies the length of the wrench.

 

[LittleInch]

Normally a vendor supplied answer. They know the torque required to close / open their valve against the flow. I think the normal force which is assumed to be applied relatively easily by a human operator is 50N (I think). Length of wrench then adjusted to equal torque required.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[cvg]

maximum rim pull of 80 lb.

 

[MikeHalloran]

Talk to the valve manufacturer, of course, but I'd guess valves that large would need either extremely long handles or gearboxes.



Mike Halloran
Pembroke Pines, FL, USA

 

[kpm21443]

Our manufacturer is offering 850 mm wrench length due to high torque to operate the valve & we are afraid that such a long wrench will interfere when installed in the line. We checked the design STD API 609 but it is not clear as to what should be the max allowable torque. Our manufacturer is offering hand wheel operation but my end user requires wrench operation only. Please advise how to determine the max allowable torque for this valve (butterfly valve 6”, CL 150, BS 1400 ALLOY AB2, SHORT WAFER, FLANGELESS, WRENCH OPERATED)

 

[LittleInch]

You're asking the wrong people. The vendor will have this information.

I don't really follow your issue. You asked the vendor for wrench actuator and he's supplied on. It's a bit long which is why they normally come as gear operated at this size.

The valve data sheet should supply all the information you need.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Running82]

This problem is easy to sort out.

From my view,

1. you ask the torque from the manufacturer. They will give you easily.
2. you give the torque and wrench length information to your end user and let them decide whether they are acceptable.
3. If yes, use wrench. If no, use gear box. Of coz, it will be somehow more expansive to use gear box. But for safety and easy use, it worth.