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Causes for Safety Valves that Weep
"I've got a customer with a safety valve that weeps. Is there any common cause for this?"
There are several causes. The most common is the set (or popping) pressure of the valve is too close to the operating pressure of the boiler or pressure vessel. A safety valve exposed to pressure at or near its set pressure will tend to weep or " simmer".
Check the operating manual for the recommended differential between the safety valve set pressure and system operating pressure. If the manual is not available, a good rule-of-thumb is to set pressure at 1) 10% of operating pressure; or 2) Five PSI; (which ever is greater), above the systems operating pressure. Remember, the greater the difference between set pressure and operating pressure - the better your valve will operate.
Here is a quick reference to the types of pressure associated with safety valves.
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