Malleable Iron 331 Flat Seat Union M/F NPT Thread

Size: 1/2”-2”
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 331 Flat Seat Union M/F. Flat seat union M/F is a kind of flat seat union. The function is same with 330 flat seat union, just the threaded is difference. Depend on the threaded of your pipe, you can choose the right union.

Product Drawing

Size L(mm) PCS/CTN.
1/2″ 64 140
3/4″ 70 120
1″ 78 80
1-1/4″ 88 40
1-1/2″ 93 32
2″ 104 20

The gasket in flat seat union:

The gasket in the flat seat union is usually made of rubber material, which has good elasticity and sealing performance. The rubber ring is placed between the two connecting parts to achieve a sealing effect through compression and prevent fluid leakage. The material of the rubber ring usually needs to be oil-resistant, corrosion-resistant, high-temperature resistant and other properties to ensure its service life and sealing performance.

In the flat seat union, the role of the rubber ring is crucial. It not only needs to withstand the tightening force of the bolts, but also needs to maintain sealing performance in various working environments. Therefore, choosing the appropriate rubber ring material and specifications is crucial to ensure the normal operation of the flat seat oil seal.

How to choose the right gasket in the flat seat union?

1. Working environment: The working environment of the rubber ring has a great impact on its performance. For example, if the rubber ring needs to come into contact with oil or organic solvents, you should choose a material with good oil resistance; if you need to work in a high temperature environment, you should choose a high temperature resistant material; if you need to work in a low temperature environment, you should choose a low temperature resistant material. Material.
2. Fluid medium: Different fluid media have different corrosive effects on the apron. The compatibility of the apron with the medium should be considered. For example, when transporting highly corrosive media such as acids, alkalis, and salts, rubber rings with good corrosion resistance should be used.
3. Pressure: The apron needs to withstand a certain amount of pressure, and the apron of the corresponding material should be selected according to the pressure level.
4. Temperature: The operating temperature of the apron is also a factor that needs to be considered when selecting. If the apron needs to work in a high or low temperature environment, you should choose an apron that can withstand high or low temperatures.
5. Cost: On the premise of meeting performance requirements, cost factors should be considered and cost-effective rubber rings should be selected.