Summary New-Style Safety Valves

By Steam Engine Staff
September 2006
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To improve the operation of a new-style safety valve when used on a hand-fired boiler:

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• Specify that the blowdown be 4 percent or less

• Specify the valve on the basis of the heating surface, not on the basis of the pipe size of the original valve

• Insist on a valve with an ASME "V" stamp

• Consider using a valve larger than the smallest one allowed by the code

• Try to find a valve distributor who is familiar with the unique requirements of hand-fired boilers

• Do not install any fitting that is smaller than the inlet to the valve

• Do not install any fitting that is smaller than the outlet to the valve

• Do not install any valve between the safety valve and the boiler

• Do not use a pipe wrench to install a safety valve

• Verify the accuracy of your steam gauge before firing your boiler the first time after installing a new safety valve

• Verify the accuracy of the setpoint and blowdown

• Do not assume that the gauge is wrong if it does not agree with the setpoint of a new valve

• Do not operate the boiler close to the setpoint of the safety valve any more than necessary

• Do not pop the valve more often than necessary

• Consider installing an old-style valve set to pop below the setpoint of the new valve



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