GB Piston-lift Type Check Valve

The GB Piston-lift Type Check Valve is a high-performance industrial check valve designed and manufactured in strict accordance with national standards. It is specifically engineered to prevent reverse flow of media in pipeline systems, ensuring the safety, stability, and efficiency of industrial processes. This valve adopts a reliable piston-lift structure, where the piston disc moves vertically along the guide sleeve with the change of medium flow velocity and pressure difference. When the medium flows forward, the piston is lifted by the fluid pressure, allowing unobstructed passage; when the medium tends to reverse, the piston is quickly closed by the reverse flow pressure and its own weight, achieving an instant seal and effectively preventing backflow.

I. Product Introduction

The GB Piston-lift Type Check Valve is a high-performance industrial check valve designed and manufactured in strict accordance with national standards. It is specifically engineered to prevent reverse flow of media in pipeline systems, ensuring the safety, stability, and efficiency of industrial processes.

This valve adopts a reliable piston-lift structure, where the piston disc moves vertically along the guide sleeve with the change of medium flow velocity and pressure difference. When the medium flows forward, the piston is lifted by the fluid pressure, allowing unobstructed passage; when the medium tends to reverse, the piston is quickly closed by the reverse flow pressure and its own weight, achieving an instant seal and effectively preventing backflow.

The valve features a standard flange connection design, which is consistent with universal industrial pipeline specifications and facilitates quick installation and maintenance. It is widely used in petroleum, chemical, power generation, metallurgy, water supply and drainage, and other industrial fields, suitable for various media such as water, steam, oil, gas, and chemical solutions. With excellent sealing performance, sturdy structure, and stable operation, the GB Piston-lift Type Check Valve provides a reliable solution for pipeline systems with strict requirements on reverse flow prevention.

II. Product Features

Reliable Reverse Flow Prevention: Adopting a precision piston-lift structure, the valve disc moves vertically along the guide sleeve, ensuring fast and tight closing when the medium flow reverses. It effectively prevents backflow, water hammer, and other pipeline problems, protecting pumps, compressors, and other key equipment in the system.
Excellent Sealing Performance: The piston disc and valve seat are made of high-quality materials and processed with precision. The hard-sealed or soft-sealed structure ensures a tight fit between the sealing surfaces, achieving zero leakage under rated working conditions. Even in long-term operation, the sealing performance remains stable, avoiding safety hazards and economic losses caused by medium leakage.
Smooth Flow Channel & Low Pressure Loss: The internal flow channel of the valve is designed with a streamlined structure, and the piston-lift design ensures that the valve disc is fully lifted when the medium flows forward, minimizing flow resistance and pressure loss. It improves the overall efficiency of the pipeline system and reduces energy consumption.
Sturdy and Durable Structure: The valve body and bonnet are made of high-quality carbon steel, stainless steel, or alloy steel, which have excellent mechanical properties, corrosion resistance, and high-temperature resistance. The overall structure is reasonably designed, with strong pressure-bearing capacity and impact resistance, capable of adapting to harsh industrial working environments. The internal components are wear-resistant and fatigue-resistant, significantly extending the service life of the valve.
Easy Installation and Maintenance: The valve adopts a standard flange connection mode, which is consistent with JB/T79 standards and can be quickly installed and connected without special tools. The valve has a simple internal structure, and the piston disc and guide sleeve are easy to disassemble and replace, facilitating later inspection and maintenance, reducing maintenance costs and downtime.
Wide Application Range: It can be applied to various media, including water, steam, oil, gas, and various chemical solutions. It is suitable for a wide range of nominal pressures and temperatures, meeting the needs of different industrial fields such as petroleum refining, chemical engineering, thermal power generation, water supply and drainage, and metallurgy.
Strict Compliance with National Standards: The valve is designed, manufactured, and tested in strict accordance with relevant national standards, ensuring stable product quality and reliable performance. It can be perfectly matched with other national standard pipeline components, improving the interchangeability and compatibility of the system.

III. Technical Data

3.1 Standards

Standard Item	Specification
Design and Manufacture	GB/T12235
Face to Face Dimensions	GB/T12221
End Flange Dimension	JB/T79
Pressure Test	JB/T9092

3.2 Test Pressure (MPa)

Nominal Pressure PN (MPa)	Shell Test (Water)	Seal Test (Water)	Back Seal Test (Water)	Air Seal Test (Air)
1.6	2.4	1.8	1.8	0.5~0.7
2.5	3.8	2.8	2.8	0.5~0.7
4.0	6.0	4.4	4.4	0.5~0.7
6.4	9.6	7.0	7.0	0.5~0.7
10.0	15.0	11.0	11.0	0.5~0.7
16.0	24.0	18.0	18.0	0.5~0.7

3.3 Materials for Main Parts

Name	Material
Body/Bonnet	CF8, CF3, CF8M, CF3M, WCB, LCB, WC6, WC9, C5
Wedge	CF8, CF3, CF8M, CF3M, WCB, LCB, WC6, WC9, C5
Gasket	PTFE, Graphite
Bolt	Stainless Steel, 35CrMoA
Nut	Stainless Steel, 45, 35CrMoA

3.4 Basic Technical Parameters

Item	Specification
Valve Model	GB Piston-lift Type Check Valve
Valve Type	Piston-lift Check Valve
Nominal Diameter (DN)	DN15 – DN300
Nominal Pressure (PN)	1.6 MPa, 2.5 MPa, 4.0 MPa, 6.4 MPa, 10.0 MPa, 16.0 MPa
Body Material	CF8, CF3, CF8M, CF3M, WCB, LCB, WC6, WC9, C5
Trim Material (Wedge)	CF8, CF3, CF8M, CF3M, WCB, LCB, WC6, WC9, C5
Gasket Material	PTFE, Graphite
Connection Type	Flange (JB/T79 standard)
Working Medium	Water, Steam, Oil, Gas, Chemical Solutions, etc.
Working Temperature Range	Depends on body material (up to 600℃ for alloy steel materials)
Sealing Performance	Leakage-free under rated seal test pressure
Test Standard	JB/T9092

Ⅳ．The main shape and connection size

Type	DN(mm)	Dimension(mm)
Type	DN(mm)	L	D	D1	D2	D6	b-f	f1	z- Φd	H
H H41W-16 Y	15	130	95	65		45	14-2		4- Φ14	90
	20	150	105	75		55	14-2		4-Φ14	105
	25	160	115	85		65	14-2		4- Φ14	115
	32	180	135	100		78	16-2		4- Φ18	120
	40	200	145	110		85	16-3		4- Φ18	130
	50	230	160	125		100	16-3		4- Φ18	140
	65	290	180	145		120	18-3		4- Φ18	150
	80	310	195	160		135	20-3		8- Φ18	170
	100	350	215	180		155	20-3		8- Φ18	185
	125	400	245	210		185	22-3		8- Φ18	195
	150	480	280	240		210	24-3		8- Φ23	225
	200	600	335	295		265	26-3		12- Φ23	250
	250	650	405	355		320	30-3		12- Φ25	270
	300	750	460	410		375	30-3		12- Φ25	300
H H41W-25 Y	15	130	95	65		45	16-2		4-Φ14	90
	20	150	105	75		55	16-2		4-Φ14	105
	25	160	115	85		65	16-2		4-Φ14	115
	32	180	135	100		78	18-2		4- Φ18	120
	40	200	145	110		85	18-3		4- Φ18	130
	50	230	160	125		100	20-3		4- Φ18	140
	65	290	180	145		120	22-3		8- Φ18	150
	80	310	195	160		135	22-3		8- Φ18	170
	100	350	230	190		160	24-3		8- Φ23	185
	125	400	270	220		188	28-3		8- Φ25	195
	150	480	300	250		218	30-3		8- Φ25	225
	200	600	360	310		278	34-3		12- Φ25	250
	250	650	425	370		335	36-3		12- Φ30	270
	300	750	485	430		390	40-4		16- Φ30	300
H H41W-40 Y	25	160	115	85	65	58	16-2	4	4- Φ14	115
	32	180	135	100	78	66	18-2	4	4- Φ18	120
	40	200	145	110	85	76	18-3	4	4- Φ18	130
	50	230	160	125	100	88	20-3	4	4- Φ18	140
	65	290	180	145	120	110	22-3	4	8- Φ18	150
	80	310	495	160	135	121	22-3	4	8- Φ18	170
	100	350	230	190	160	150	24-3	4.5	8- Φ23	185
	125	400	270	220	188	176	28-3	4.5	8- Φ25	195
	150	480	300	250	218	204	30-3	4.5	8- Φ25	225
	200	600	375	320	282	260	38-3	4.5	12- Φ30	250
H H41W-64 Y	15	170	105	75	55	40	18-2	4	4- Φ14	110
	20	190	125	90	68	51	20-2	4	4- Φ18	125
	25	210	135	100	78	58	22-2	4	4- Φ18	152
	32	230	150	110	82	66	24-2	4	4- Φ23	168
	40	260	165	125	95	76	24-3	4	4- Φ23	170
	50	300	175	135	105	88	26-3	4	4- Φ23	188
	65	340	200	160	130	110	28-3	4	8- Φ23	205
	80	380	210	170	140	121	30-3	4	8- Φ23	230
	100	430	250	200	168	150	32-3	4.5	8- Φ25	280
	125	500	295	240	202	176	36-3	4.5	8- Φ30	300
	150	550	340	280	240	204	38-3	4.5	8- Φ34	350
	200	650	405	345	300	260	44-3	4.5	12- Φ34	400

About Us

Founded in 2016, Shanghai Wangye Valve Manufacturing Co., Ltd. is a professional industrial fluid control manufacturer with nearly a decade of experience, integrating R&D, intelligent production, sales, and customized solutions. Leveraging Shanghai’s advanced manufacturing advantages, we’ve built a reliable brand across petrochemicals, power, metallurgy, water treatment, and new energy industries, offering gate/ball/butterfly valves and tailored solutions for harsh conditions. Backed by advanced equipment, full-process quality control, and ISO certifications, we adhere to “Integrity, Quality, Customer Focus, Innovation” and provide comprehensive services, striving for long-term cooperation and continuous technological upgrading.

Why Choose Us

Talent and Efficient Team

WYE always insists that employees are the most valuable asset of the enterprise and the future of WYE; Adhere to prioritizing talent selection, education, and utilization in the development of enterprises; introducing talent as the highest return investment behavior. We regard talent as the primary resource for effective management, and pursue a high degree of harmony and unity between employee personal development and enterprise development.We encourage you to have a special perspective, think independently, and be good at organizing resources from all parties. Always maintain a responsible attitude towards results and a positive team spirit that is willing to share in every task..

High End Processing Equipment Creating Excellent Product Quality

Advanced automated production equipment and sophisticated assembly line production demonstrate first-class quality.Technical experts directly participate in production to ensure the concealment and reliability of the product.The increasing awareness of high-quality products and the continuous supply of industrial products have made WYE constantly changing.No matter how the world changes, the persistent spirit of excellence among WTE people remains unchanged.

Warehouse Strength

In our facility, raw materials (including core components and packaging supplies) are strictly controlled via a real-time digital inventory system—tracking batches, shelf life, and storage conditions to boost traceability and cut waste. Semi-finished products, post-preliminary quality checks, are stored per strict industry standards: labeled with progress/inspection records to avoid cross-contamination and damage. Finished products are sorted into specialized warehouses by type, market, and delivery schedule, streamlining picking and reducing dispatch delays. This standardized process effectively boosts efficiency: cutting redundant steps by 30%, shortening fulfillment cycles by 20%, and minimizing inventory/shipment errors.

Customized Solutions & After-Sales Support

Tailored to the distinct demands of industries like petrochemicals, new energy, and metallurgy, WYE provides personalized industrial fluid control solutions—covering pre-project demand assessment, customized valve design (matching specific working conditions like pressure or medium type), and on-site technical consultation to align with clients’ operational scenarios. Additionally, we offer comprehensive after-sales support: including on-site installation guidance, regular equipment maintenance inspections, and 24/7 responsive fault troubleshooting, which ensures the stable operation of clients’ systems and strengthens long-term cooperative partnerships.

Our Services

Our company is a one-stop solution for all valve-related needs, offering customization to tailor valves to unique specifications, professional installation & commissioning for seamless integration and optimal performance, maintenance & repair to keep valves in top condition and extend their lifespan, and technical support & consultation for expert advice on selection, optimization, and troubleshooting throughout every project stage.

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EXHIBITION & PROJECTS

COOPERATIVE PARTNER

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GB Piston-lift Type Check Valve

I. Product Introduction

II. Product Features