Class 125 Swing Check Valve with Lever and Weight

Model：CV-03
Date Updated: August 13, 2026
Prepared by: Swing Check Valve Technical Department

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Ningjin APC Industries is a premier UL & FM certified manufacturer in China, delivering high-performance industrial and fire protection valves built to strict international safety standards.

Class125 Swing Check Valve with Lever and Weight

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Class 125 Swing Check Valve with Lever and Weight

▏Product Description

Ningjin APC Industries proudly presents the Class 125 Swing Check Valve with Lever and Weight, engineered specifically for rigorous industrial water, wastewater, and general fluid control systems. Built to strict compliance standards including MSS SP-71 and tested per API 598, this industrial check valve ensures exceptional backflow prevention and operational reliability under demanding conditions. Featuring a robust ductile iron body, brass seat rings, and an exterior lever-and-weight mechanism, it delivers precise control and minimizes water hammer risks. We offer comprehensive OEM/ODM customization services with a stable manufacturing and delivery lead time of 30-45 working days, making us the preferred supplier for global EPC contractors and industrial procurement managers seeking high-performance fluid control solutions.

▏Technical Features

Parameter Item	Specification Value
Size	DN40-DN900 / 1.5"-36"
Working Pressure	Class 125
Design Standard	MSS SP-71
Test Standard	API 598
Flange Standard	ASME / ANSI B16.1 Class 125 or 16.42 Class 150 or BS EN 1092-2 PN16
Face to Face Standard	ASME B16.10 or BS EN558-1
Working Temperature	-20°C to 180°C

▏Valve Material List

NO.	Part	Material
1	Body	Ductile Iron / Cast Iron
2	Body Seat Ring	Brass
3	Disc Seat Ring	Brass
4	Disc	Ductile Iron
5	Washer	Carbon Steel
6	Locking Nut	Carbon Steel
7	Arm	Ductile Iron
8	Hing Pin	Stainless Steel
9	Plug	Carbon Steel
10	Gasket	TFL
11	Gasket	NBR
12	Bolt	Carbon Steel
13	Bonnet	Ductile Iron
14	Gland	Ductile Iron
15	Hammer	Ductile Iron
16	Hinge	Ductile Iron / Cast Iron

▏Dimensions

DN	INCH	ØD	L	b	ANSI 150 ØD1	ANSI 150 Z-Ød	H
40	1.5"	127	165	15	98.4	4-16	120
50	2"	152	203.2	16	120.7	4-19	137
65	2.5"	178	216	17.5	139.7	4-19	143
80	3"	191	241	19	152.4	4-19	154
100	4"	229	292	24	190.5	8-19	171
125	5"	254	330.2	24	215.9	8-22	204
150	6"	279.4	355.6	25.5	241.3	8-22	219
200	8"	343	495	30	298.5	8-22	258.9
250	10"	406	622	30	362	12-25.4	291
300	12"	483	698.5	32	431.8	12-25.4	326
350	14"	533	787	35	476.3	12-28.6	362
400	16"	597	914	37	539.8	16-28.6	389
450	18"	635	1016	39.7	577.9	16-32	533
500	20"	699	1016	43	635	20-32	536
600	24"	813	1219	48	749.5	20-35	617
750	30"	984	1422	54	914.5	28-35	767
900	36"	1168	1956	60.5	1086	32-41	963

▏Frequently Asked Questions

What are the primary design and testing standards for the Class 125 Swing Check Valve with Lever and Weight?

The Class 125 Swing Check Valve with Lever and Weight is manufactured in strict accordance with the MSS SP-71 design standard to guarantee structural integrity and long-term durability in fluid handling networks. For quality assurance and performance validation, every valve undergoes rigorous hydrostatic and pneumatic testing complying with the API 598 standard before leaving our manufacturing facility. Additionally, flange dimensions comply with ASME/ANSI B16.1 Class 125, 16.42 Class 150, or BS EN 1092-2 PN16 specifications, while face-to-face dimensions follow ASME B16.10 or BS EN558-1 standards, ensuring seamless integration into diverse international piping layouts and industrial infrastructure projects.

What materials are utilized in the construction of the Class 125 Swing Check Valve with Lever and Weight body and internal components?

The Class 125 Swing Check Valve with Lever and Weight is engineered using premium, corrosion-resistant materials to withstand harsh industrial operating environments. The main valve body, bonnet, disc, arm, and gland are constructed from durable ductile iron or cast iron, providing exceptional mechanical strength. The body seat rings and disc seat rings are precision-machined from high-quality brass to ensure a tight, reliable seal and minimize wear over extended operational cycles. Internal fasteners and structural elements, such as the hinge pin, utilize stainless steel and carbon steel with protective coatings, while gaskets are made from TFL and NBR materials to maintain leak-proof performance across a wide temperature range from -20°C to 180°C.

What are the available size ranges and working pressure ratings for the Class 125 Swing Check Valve with Lever and Weight?

The Class 125 Swing Check Valve with Lever and Weight is available in a comprehensive range of nominal sizes from DN40 to DN900 (1.5 inches to 36 inches), accommodating various pipeline diameters in large-scale municipal and industrial systems. It is engineered specifically for a Class 125 working pressure rating, delivering stable performance across low to medium pressure applications. Industrial buyers seeking detailed technical drawings, customized configurations, or bulk procurement options can explore our official product portal at Class 125 Swing Check Valve with Lever and Weight specifications to review complete dimensional charts, weight distributions, and engineering data sheets tailored for modern EPC contracting and fluid management projects.

How does the lever and weight mechanism function on the Class 125 Swing Check Valve with Lever and Weight?

The lever and weight mechanism attached to the Class 125 Swing Check Valve with Lever and Weight plays a crucial role in mitigating pressure surges and controlling disk closure dynamics. As fluid flows forward, the disc swings open freely to allow unobstructed media passage. When flow reverses, the external lever and adjustable weight exert gravitational force to assist the rapid, controlled closure of the valve disc. This mechanical dampening effect effectively absorbs kinetic energy, prevents sudden water hammer shocks, protects downstream equipment from destructive pressure spikes, and extends the overall service life of industrial water treatment and wastewater transport pipelines.

What is the typical production lead time and OEM customization policy for the Class 125 Swing Check Valve with Lever and Weight?

Ningjin APC Industries provides flexible OEM and ODM manufacturing services for the Class 125 Swing Check Valve with Lever and Weight to meet exact project specifications and unique engineering requirements. The standard production and delivery lead time ranges from 30 to 45 working days, ensuring reliable scheduling for international EPC contractors, plant operators, and industrial distributors. Our engineering team collaborates closely with clients to deliver customized flange drillings, specialized anti-corrosion coatings, and tailored dimensional configurations, backed by stringent factory quality management systems to guarantee flawless performance upon installation in global fluid control projects.

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