Malleable iron M&F Union Fig 331 (flat seat) beaded DIN

Product Overview

This malleable iron M&F Union Fig 331 (flat seat) with beaded edge is manufactured in accordance with DIN standards. It is designed with one male thread and one female thread, adopting flat seat structure for stable and tight sealing. The beaded structure strengthens the pipe end to prevent deformation and cracking. Made of high-quality black heart malleable iron, it features high strength, good toughness and convenient disassembly, widely used in water, gas, oil, steam, fire fighting and other low-pressure fluid piping systems.

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Product details

Malleable iron M&F union (flat seat) has female thread on one side and male thread on the other side. It can make pipe connection more convenient. It is the flat seat inside and a rubber ring on the seat for sealing.

Product Features (Specifications – Plain English List)

Standard: DIN EN 10242

Type: M&F Union Fig 331 (flat seat) beaded

Material: Black heart malleable iron

Thread standard: DIN 2999

Pressure class: 150LB

Temperature range: -20℃ ~ 230℃

Surface treatment: Black / Electro-galvanized / Hot-dip galvanized

Application: Water, gas, oil, compressed air, steam, fire fighting

Specifications Table (Dimensions & Parameters)

Size	Inch	1/4	3/8	1/2	/3/4	1	11/4
Size	mm	8	10	15	20	25	32
Dim.(mm)	A	58	61	69	75	83	93
Size	Inch	11/2	2	21/2	3	4
Size	mm	40	50	65	80	100
Dim.(mm)	A	98	109	121	133	136

Product Applications

Detachable connection in narrow space plumbing pipelines
Easy maintenance connection in fire fighting sprinkler systems
Quick assembly and disconnection of gas and heating pipelines
Industrial compressed air and oil pipeline detachable connection
Marine, mining and construction piping convenient connection

Installation and Maintenance

Inspect the Union Fig 331for cracks, deformation and intact beads before installation
Check the flat gasket for integrity and install it in correct position
Clean threads and apply PTFE tape or thread sealant
Tighten evenly with a wrench to ensure good sealing
Do not over-tighten to avoid thread or gasket damage
Regularly check for leakage, rust and looseness

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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]