125Lb Bronze Seated Swing Check Valve-MSS SP-71

Valve Type Swing Check
Body Material Cast Iron (ASTM A126 Class B) / Ductile Iron (ASTM A536)
Disc Material Cast Iron / Ductile Iron
Seat Material Bronze Alloy (e.g., ASTM B62 C83600)
Connection Type Flanged
Flange Standard ASME B16.1 (Cast Iron) / ASME B16.5 (Class 125/150)
Pressure Rating Class 125 / Class 150
Temp. Range -10°C to +200°C
Media Water, Steam, Oil, Gas, other non-corrosive fluids

Description

Technical Data Sheet: Bronze Seated, Cast Iron Body, Swing Check Valve

Product: Bronze Seated, Cast Iron Body, Swing Check Valve
Model: H71X-16 / H71W-16 | Design Std: MSS SP-71, API 594, ASME B16.34 | Connection: Flanged

Overview:
A swing check valve designed to prevent reverse flow in pipelines. The cast iron body offers high strength, while the bronze sealing surfaces provide excellent corrosion resistance and durability, ensuring reliable, long-term sealing performance in demanding applications. Features a compact design, low flow resistance, and smooth operation. Ideal for water supply, drainage, fire protection, HVAC, and general industrial services.

Key Specifications:

Parameter	Specification
Valve Type	Swing Check
Body Material	Cast Iron (ASTM A126 Class B) / Ductile Iron (ASTM A536)
Disc Material	Cast Iron / Ductile Iron
Seat Material	Bronze Alloy (e.g., ASTM B62 C83600)
Connection Type	Flanged
Flange Standard	ASME B16.1 (Cast Iron) / ASME B16.5 (Class 125/150)
Pressure Rating	Class 125 / Class 150
Temp. Range	-10°C to +200°C
Media	Water, Steam, Oil, Gas, other non-corrosive fluids

Design & Features:

Construction: Single-disc, swing-type design with a lever arm mechanism.
Flow Path: Full bore or reduced bore design with a streamlined flow passage for low pressure drop.
Sealing: Bronze seat ring mates with the metal disc for reliable, wear-resistant, and galling-resistant sealing.
Operation: Automatic opening by media flow pressure; automatic closing by disc weight and backflow.
Installation: Must be installed in a horizontal line with the pivot pin horizontal.

Principal Dimensions & Weights (Class 150, Typical):

NPS	L (mm)	H (mm)	Flange OD (mm)	Bolt Circle (mm)	Bolt Holes (n x φ)	~Weight (kg)
2″	203	115	120	92.1	4 x 19	8
3″	216	140	152	120.7	4 x 19	12
4″	254	175	190	152.4	8 x 19	22
6″	356	250	279	241.3	8 x 22	45
8″	495	340	343	298.5	8 x 22	85
10″	622	430	406	362.0	12 x 25	135
12″	698	510	483	431.8	12 x 25	200

Testing & Inspection:

Shell Test: Per API 598 / MSS SP-71 @ 1.5 x PN, no leakage.
Seat Test: Per API 598 / MSS SP-71 @ 1.1 x PN, no leakage.

GUATANTEE

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.

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