Summary New-Style Safety Valves

| September 2006

To improve the operation of a new-style safety valve when used on a hand-fired boiler:

• 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