Malleable Iron 342 Brass Seat Union NPT Thread

Code:342
Size: 1/4”-4”
Material: ANSI/ASTM A197-A,KTH350-10
Dimension: ANSI/ASTM B16.3/14/39
Thread: ANSI/ASTM B1.20.1,NPT
Pressure Rating: 363PSI,CLASS150
Surface Treatment:Hot-dip Galvanized,Electro Galvanized,Black
Zinc Coating: ASTM A 153
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 342 Brass Seat Union. Compare with the flat seat union, the brass seat union is taper seat and can be connect with pipe tightly. Compare with the taper seat union, the materials of seat is brass. Brass is softer than malleable iron, so the brass seat union has better sealing than taper seat union.

Product Drawing

Size L(mm) PCS/CTN.
1/4″ 42 200
3/8″ 45 200
1/2″ 47 180
3/4″ 51 120
1″ 56.5 88
1-1/4″ 64 56
1-1/2″ 70 36
2″ 78.5 28
2-1/2″ 84.5 12
3″ 94 10
4″ 110 6

Comparison of three types of union:

1. Flat seat union, code 330. The inside seat is flat and always have a gasket on the flat seat. Gasket will increase sealing performanceIt is used in the normal water pipe line system.

2. Taper seat union, code 340. Named conical joint union. The inside seat is tapered and without gasket. Taper seat has good resilience and sealing performance, so for some occasions that require high sealing performance, such as high pressure, high temperature or large pressure fluctuations, taper seat union may be more suitable.

3. Brass seat union, code 342. The inside seat is tapered and without gasket but with a brass circle. Because the brass is a soft metal, it can be connected more tightly to pipes, so it has better sealing performance and high temperature resistance than taper seat union. Brass seat union is the most expensive one.

Application for three types of union.

1. Flat seat union, code 330. The price of flat seat union is relatively low, and they are usually used in some situations where sealing requirements are not high or pipelines where temperature requirements are not high, such as normal pressure or low pressure pipelines, containers, etc.

2. Taper seat union, code 340. Taper seat union have good resilience and sealing performance, so they may be more suitable for situations that require high sealing performance, such as high pressure, high temperature, or situations with large pressure fluctuations. In addition, the conical seat union can better fit the contact surface when rotating or moving, making it less likely to cause leakage.

3. Brass seat union, code 342. Brass seat union is used in pipelines with higher pressure requirements and pipelines with high temperatures.