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Hammer Unions Work
A hammer unions are comprised of a thread end, a nut end and a hammer nut which, when cinched up, compresses a composite seal assembly thereby preventing leakage.
The seal assembly comprises a metal insert of a size to pass into the seal groove of conventional hammer unions and a small seal acting between the insert, the thread end and the nut end.
The small seal is conveniently an O-ring or a Hammer Union Seal (Lip Seal) and is of a size that is compressed when the seal assembly is inserted into the thread end of the hammer union.

Hammer Unions Explanation
Hammer Unions are designed as heavy duty, high pressure flow line connectors.
They are commonly found in chemical plants, on marine dredging vessels, in strip mines and in the oil industry (depending on model, for sand slurry, oil, water, steam, etc).

Hammer unions are manufactured from steel forgings using materials appropriate to specific pressure ratings. Most widely used material grade is A105 steel.

Recommended For:
Hammer Unions can be used for cementing trucks, oil field applications, for quick connection on tank trucks and rail cars carrying of LPG, LNG, CNG, etc., all kinds of manifolds and other high pressure equipment and pipes. Hammer Unions have good mechanical performance and sealing property.

Especially, they can operate under the bad weather condition. They can be assembled, fixed and changed easily and conveniently. They are very easy to use as they are self-aligning, and do not require any special tools. It takes some seconds as compared to several minutes required with flanged connection. Hence in case of railway wagon loading, where large numbers of connections are to be made in each loading operation.

Main Types:
Hammer Union type mainly consists of Figure50, Figure100, Figure200, Figure206, Figure207, Figure400, Figure600, Figure602, Figure1002, Figure1002 and Figure1502.Fig100 Hammer Union These low pressure hammer unions are ideal for manifold and applications where CWP does not exceed 1000 PSI.