Pipe Union is a fitting equipment that unites two pipes and they can be detached without causing any deformation to the pipes. Small diameter piping connections that require a positive seal and easy assembly as well as disassembly are made with the help of union.

Union provides a leak-proof disconnection point in any PVC plumbing application and at a low cost. If a valved-disconnection point is required, use a single-union ball valve. A standard union pipe is made in three parts, consisting of :

When the female and male ends are joined, the nuts then provide the necessary pressure to seal the joint. Since the mating ends of the union are interchangeable, changing of a device can be achieved with a minimum loss of time.

Unions are commonly used for inserting metering and regulating devices into a piping system or for connecting piping system to vessels. There are two types of pipe unions:

The Ground joint union consists of three pieces. It most commonly has a brass grounding section between the two halves.

A Flange Union is made in two parts. An economical, practical and reliable alternative to welded and screwed systems, a Union Flange joins plain-ended pipe to flange-ended equipment, fittings and valves and on-site installation is simple. Union Flange is a unique solution to the problems which can occur in the use of pro-fabricated flanged piping, such as downtime, reliance on off-site suppliers and inaccurate dimensions. The design of the Union Flange comprises three elements: the flange, the gasket and the restraint.

Both types are used for joining two pipes together and are designed so that they can be disconnected easily. Unions are successful in numerous municipal and industrial applications such as fire protection, water and wastewater, and process piping systems.