Malleable Iron 330 Flat Seat Union BSPT Thread

Size: 3/8”-4”
Material: BS EN 1562,EN-GJMB-350-10,KTH350-10
Dimension: BS EN 10242
Thread: ISO 7-1,BS 21,BSPT
Pressure Rating: PN16/PN25
Surface Treatment: Hot-dip Galvanized,Electro Galvanized,Black
Certificate: UL Listed / FM Approved / NSF 61
Application: Fire Protection,Waterworks,HVAC,Plumbing,GAS,Irrigation,or other piping systems

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Product Description

Products Details

Malleable Iron pipe fittings 330 Flat Seat Union.Also called union with flat seat. This union has a gasket. There are two type gasket ,one is rubber gasket ,other one is silicone gasket.According to Surface treatment ,Galvanized flat seat union,GI flat seat union ,hot-dip Galvanized union with flat seat union ,black union with flat seat union,BMI union with flat seat union,Black iron union with flat seat. According to the weight, heavy type union ,medium type union ,light type union. According to the union seat ,flat seat union ,conical seat union ,brass seat union. Brass seat union price is expensive than conical seat union. Conical seat union expensive than flat seat union.

Product Drawing

Size A(mm) PCS/CTN. Size A(mm) PCS/CTN.
1/4” 1 1/2” 68 36
3/8” 280 2” 76 28
1/2” 46 180 2 1/2” 83 12
3/4” 50 120 3” 80 10
1” 56 88 4” 100 6
1 1/4” 63 56 6”


Union is also called pipe connection or union joint. It is a common pipe connection that can be easily installed and disassembled. The pipe fittings connecting the two pipes can separate the two pipes without moving the pipe, which is convenient for maintenance. It contains 3 parts: threaded head, ball head and nut.

The sealing surface inside the non has a flat surface (with pad), spherical surface, cone surface, etc.
The connection methods between the non and the pipeline include butt welding, socket welding, thread, etc. It is mainly composed of three parts: nut, cloud head and flat joint. Pipe connection machined by round steel or steel ingot die forging, its connection form is sub-socket welding and threaded connection, socket welding is to insert the steel pipe into the socket for welding, therefore, it is called “socket union”, threaded connection is to screw the steel pipe into the screw hole for connection, therefore, it is called “thread union”.

The varieties of union are equal diameter and different diameter.

The socket union is composed of socket, etc., which is characterized in that there is a socket on the socket, and the socket and socket are located at both ends; Compared with the existing technology, the design is reasonable, the operation is simple, the practicality is strong, and the operation quality and convenience are improved.

Union can be widely used in pipelines of different calibers, and can also be used for water meters and valves. Due to the socketing structure, the pipe joint reduces the cost, installation, use and maintenance are extremely convenient, and at the same time has a very high leak-proof ability, which is very promising.

Application and Case

Products are used in fire protection system, water system, HVAC system, plumbing, gas system, irrigation system, etc.These products are used in many projects , such as Beijing Airport, Shanghai World Trade Center, Canton Tower and other famous landmark projects.