Malleable iron Union Fig 342 A197 NPT (brass seat) ASTM Black finish

Product Overview

This malleable iron Union Fig 342 A197 NPT with brass seat is manufactured in accordance with ASTM standards. It adopts a brass sealing seat in the middle, providing better sealing performance, high temperature resistance and wear resistance, with convenient assembly and disassembly, suitable for pipeline systems requiring frequent maintenance. Made of high-quality black heart malleable iron with high-temperature annealing, it features good toughness, high strength and impact resistance. With high-precision threads for firm and reliable connection, it is available in black, electro-galvanized or hot-dip galvanized finish with good corrosion resistance and long service life, widely used in water, gas, steam, fire protection and industrial low-pressure fluid piping systems.

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Product details

Product Features (Specifications – Plain English List)

Standard: ASTM A197
Type: Brass Seat Union Fig 342 A197 NPT
Material: Black Heart Malleable Iron + Brass Seat
Pressure Class: 150LB / 300LB
Temperature Range: -20℃ ~ 230℃
Thread Standard: NPT / BSP
Seal Type: Brass Seat Seal
Surface Treatment: Black / Electro-galvanized / Hot-dip Galvanized
Applicable Media: Water, hot water, oil, gas, compressed air, fire water, low-pressure steam

Specifications Table (Dimensions & Parameters)

Size	Inch	1/8	1/4	3/8	1/2	3/4	1	114
Size	mm	6	8	10	15	20	25	32
Dim.(mm）	A Min	32	36.5	41	43.5	49.5	52.5	57.5
Size	Inch	112	2	21/2	3	4	6
Size	mm	40	50	65	80	100	150
Dim.(mm）	A Min	61	70	82	89	98	145

Product Applications

Fire Protection Systems: Maintenance connections for sprinkler pipelines
Water Supply & Drainage: Detachable connections for building pipelines
HVAC & Heating: High temperature resistant Union Fig 342 A197 NPTs for boilers and radiators
Industrial Pipelines: Sealed connections for compressed air and low-pressure steam pipelines
Gas Engineering: Safe Union Fig 342 A197 NPTconnections for gas pipelines
Marine & Machinery: Low-pressure fluid pipelines requiring high sealing performance

Installation and Maintenance

Installation

Inspect the Union Fig 342 A197 NPTand brass seat before installation to ensure no cracks, damage, deformation and intact threads
Clean impurities and burrs at pipe ends to ensure clean connecting surfaces
Tighten both ends of the Union Fig 342 A197 NPTto corresponding pipelines and align the brass seat
Tighten the Union Fig 342 A197 NPTnut evenly to make the sealing surfaces fit tightly
Conduct pressure test after installation and use only after confirming no leakage and looseness

Maintenance

Regularly check joints for leakage, nut looseness and surface corrosion
Paint anti-rust paint for outdoor or humid environments to extend service life
Replace the whole Union Fig 342 A197 NPTimmediately when the brass seat is worn, sealing fails or the body is cracked

FAQ

Can you supply OEM?

OEM is available. We can customize the product according to your specific requirements, including logo printing and packaging design.

What’s the MOQ?

The MOQ is 500 pieces. For customized products with special sizes or surface treatments, the MOQ may vary.

How about the order processing and lead time?

After order confirmation and receipt of the advance payment, we will arrange production. Generally, the products can be ready for shipment within 15-20 working days. Once dispatched, we will notify you and provide all necessary documents for customs clearance.

What quality will be ensured?

All products are 100% new and undergo strict quality inspections, including pressure testing and dimensional checks, before delivery. We use sturdy wooden crates or cartons to ensure the products are well-protected during transportation.

Can you guide the installation?

Yes, we provide detailed installation instructions in English and other major languages. Our technical support team is also available for online consultation and guidance if needed.

Contact Information

Sales Inquiry:
Provide contact information for sales inquiries.

Email: [email protected]

Phone: +86 13012223295

Technical Support

If you have any questions regarding product installation, commissioning, operation or maintenance, please contact our technical support team for professional assistance:

Email: [email protected]