A disk type steam trap having a valve disk adapted to engage a valve seat with a double-coiled bimetallic member being provided operatively interposed between the valve disk and the valve seat on one side of the valve seat to lift and lower the valve disc relative to the valve seat in response to temperature change.Bellows Seal Valves The bimetallic member comprises a double-coiled body expanding at lower temperatures and contracting at higher temperatures. A disk type steam trap assembly comprising: a housing defining an inlet port,Forged Steel Valves an outlet port and fluid passage means in flow communication therebetween; a valve seat member defining a valve seat forming part of said fluid flow passage means; a valve disk adapted to seat on said valve seat for opening and closing said part of said fluid flow passage means;MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE and a double-coiled bimetallic member operatively interposed between said valve disk and said valve seat member, said bimetallic member being arranged to engage said valve disk on one side of said valve seat; said bemetallic member comprising a coiled strip formed into a first coil which is coiled upon itself in a second coil to form a double-coiled configuration and operating to expand at low temperature to force said disk away from said valve seat and to contract at high temperature to allow said disk to rest on said valve seat, said bimetallic member engaging said valve disk on a side of said valve seat opposite said outlet port. A disk type steam trap usually includes a valve disk adapted to rest on or be moved away from a valve seat defined by an inner seat ring and an outer seat ring of the trap with a variable pressure chamber being defined behind the disk. The position of the disk is controlled by pressure variation in the variable pressure chamber to effect the automatic discharge of condensed water. Air remaining in the variable pressure chamber, however, prevents the opening of the disk during the beginning of trap operation even if cold condensed water or air may flow into the trap. If air flows into the variable pressure chamber during trap operation, the disk is moved into its closed position instantaneously, as when steam flows into the chamber. Air is not condensed, while steam is. Once that the trap is closed, therefore, it does not open even if condensed water flows thereinto. This phenomenon is known as air locking.

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