Sato relief valves

[rickParticipant @rick72288]

The r/v's on my Saito B2F boiler are leaky and unreliable. I have replaced the O-rings and cleaned up the valve stems to no avail. I extended the springs by 0.01 which helped but not sealing as well as they should be. As ia not sure the of the thread type it is difficult to shop for replacements. The valves are set at 30 psi. Help please. Rick

[rickParticipant @rick72288]

suitable replacements

[TelstarParticipant @telstar]

Hi Rick Identifying the thread should not be an unsermountable task, essentially you need the outside diameter of the threaded part and the pitch ( that is the distance from one thread to the next).

A verneer guage would be my tool of choice, the diameter no prob. the pitch I would measure the length between say 5 turns of the thread, then do the math

the look up these dimentions on thread tables, a few are on this site (top banner right side) this should give you a good idea of thread (you may need to have your data in both inches and mm, model engineering thread is either 32 or 40 threads per inch, while metric is 0.04 to 2.5 mm pitch dependant on diameter) **LINK**

Hope this helps

Cheers Tom

[Eric Moffat 1Participant @ericmoffat1]

Gday Rick, I would be very surprised if the thread was not metric.

Why not ask saito?

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