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Dont forget...Its not just torque, it could be thrust if its a gate valve or globe valve. Typically, we use a spring as well.

Yes. You all are correct. It is to prevent a maintenance tech from using a cheater bar. I was successful in getting the spec changed, however, because I argued that it would weigh too much and be too cumbersome.

I am looking for a solid hand wheel (no spokes) for a valve application. The challenge is that I need it to be 16" in dia. Anyone know a supplier? Thanks

tsenthil: you said, "pistons require more air pressure [than diaphragms]" I think you mean piston cylinders can handle higher pressures, right? The supply pressure and the required thrust on the valve are usually given. Then, you can size the actuator based on this and stroke. Usually...

This is very common for our company. You can install a spring or double acting linear pneumatic or hydraulic piston actuator on the buried gate valve using a threaded coupling block that pulls instead of turns. You can use the media in the pipeline to provide the operating pressure for the...

A couple of clarifications/comments--- Ashereng: You mentioned "torque", but remember, you might have a linear actuator which would require "thrust" A linear pneumatic piston actuator is very common for globe control valves. JLSeagull: Recall, you can have an air fail system used in...

A 3582 is for pneumatic actuators, right? I am talking about a positioner for a hydraulic actuator.

Has anyone ever used a hydraulic positioner for a control valve? Does anything exist?

I need to machine Inconel shafts 15" long and 2" in dia. I want to do it on a CNC lathe. What special consideration does this material need? Cutting tools, speed, etc.? Thanks

Another question is what power source is available for the actuator? Better controllability while maintining speed is a challenge, but I have seen it done using a globe valve and linear actuator with both hydrualic and pneumatic sources to the actuator. Example: 8 seconds closing speed with...

Thank you all. We are getting prices for 2205. It looks favorable. ornerynorsk: Sometimes we see "nitride procesed" in the spec. Isnt this expensive?

PersianEng, Hydraulic cylinders can be very inexpensive compared to other solutions.

PersianEng What is the thrust required?

If hydraulic fluid is not acceptable, you could also use air.

rb1957, Thanks.

Our company is considering using stainless steel for the exposed parts of our machine. Currently, we use .001 in. thick chrome plated carbon steel. We are trying to slow down the rust process. Is there a major advantage to stainless steel over the chrome plate? The dimensions of the part are...

Ashereng is right. Speed can be an important spec. Electrics usually operate at only 12-15" per minute. If this stroke is 144", it might take 10 minutes to open. Likewise, if there is a power failure it may be necessary to maintain control of the valve. A hydraulic accumulator can handle...

rb1957, Can you explain the formula below? BM/(6.5/sqrt(2)) = (1970x/4)/4.5 I agree that the diamond shape is less preferable. Thanks

PersianEng, Have you considered a hydraulic piston actuator? Or does the spec require electric?

Ashereng, Somany initially stated that the current application is using gate valves. I was wondering how they are currently being actuated? Thanks