Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

API Check Valve
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Phone：+86（577）6730 7899
Mobile：+86 189 6779 6135
Fax：+86（577）6738 7099
Email：Yannie@kaiweixi.com
Address：No. 1, Linxia Road, Sanqiao Industrial Zone, Oubei Street, Yongjia County, Zhejiang Province，china
Website：https://www.kaiweixi.com

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API Check Valve

Model：API
Specification：2”-32”
Temperature：≤ 425 ℃
Medium：Water, Steam, Oil Products, Corrosive Media

Pressure：Class150LB,Class300LB,Class400LB,Class600LB,Class900LB,Class1500LB
Connection method：Flange
Driving method：automated
Material：WCB、Stainless Steel

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API Check ValveOverview

API Check Valve Overview

API check valves are automatic valves strictly designed and manufactured in accordance with the American Petroleum Institute (API) standards, primarily used to prevent medium backflow in pipelines. Their core design, materials, manufacturing, and testing comply with specifications such as API 6D. The valve body is typically made of materials like cast steel or stainless steel, with structural types including swing, lift, and dual-plate designs. These valves operate automatically using the kinetic energy of the medium flow, requiring no external intervention. They open under forward flow and close rapidly under reverse flow due to gravity, spring force, or medium pressure. Specifically designed for high-pressure, large-diameter, or safety-critical pipelines in petroleum, natural gas, refining, and chemical industries, API check valves are essential equipment for ensuring unidirectional flow and preventing backflow incidents in industrial systems.

API Check Valve Product Image

API Check ValveCharacteristic

API Check Valve Features

1. Strict Compliance with API Standards

The entire process of design, material selection, manufacturing, and testing adheres to API standards, with API 6D certification ensuring high reliability and interchangeability under harsh conditions such as high pressure and corrosion.

2. Reliable Automatic Sealing and Low Flow Resistance

Utilizes precisely matched disc and seat sealing pairs for rapid and tight closure. The unobstructed flow path when open minimizes flow resistance, making it particularly suitable for large-diameter, high-flow-rate transmission pipelines.

3. Diverse Structures for Broad Adaptability

Available in multiple structural designs, including swing, lift, and wafer dual-plate types, to accommodate various installation orientations (horizontal or vertical), medium characteristics (with particles or clean), and pressure fluctuation requirements.

4. Safety Protection and Long Service Life

Features a robust structure that effectively withstands water hammer impacts. Moving parts such as discs and levers are designed for wear and corrosion resistance. Some models are equipped with slow-closing mechanisms to reduce closure impact and extend service life.

5. Easy Maintenance and Wide Applicability

Compact and lightweight designs (e.g., wafer dual-plate type) simplify installation and maintenance. Suitable for water, steam, oil, natural gas, and various corrosive media, with a wide range of operating pressures and temperatures.

API Check Valvestructure principle

API Check Valve Structure Diagram

Parts Name Material List

NO.	Name	Material
5	seat	Carbon Steel, Stainless Steel
4	disc	Carbon Steel+STL, Stainless Steel
3	Pin	2Cr13
2	Swing Lever	Carbon Steel, Stainless Steel
1	body	Carbon Steel, Stainless Steel

API Check Valvetechnology parameter

性能规范表Performance Specification
公称压力Nominal Pressure	1.0/1.6/2.5/4/6.4	Mpa
强度试验压力Shell Test	1.5/2.4/3.75/6/9.6
密封试验压力Seal Test	1.1/1.76/2.75/4.4/7.04
适用温度Suitable Temp.	≤425	℃

API Check Valvestandard size

Dimensions Standard Requirements

1. The structural length of the valve shall conform to the standard ASME16.10.

2. The connecting flange shall conform to the standard ASME16.50.

API Check Valve View Drawing

API Check Valve Dimensions Table

NPS	DN	Class 150Lb
in	mm	L	D	D1	D2	b	Z-Φd	H
2"	50	203	157	120.7	92	19.50	4-Φ19	161
21/2"	65	216	178	139.7	105	22.5	4-Φ19	180
3"	80	241	190.5	152.4	127	24	4-Φ19	190
4"	100	292	229	190.50	157.2	24	8-Φ19	220
6"	150	356	279	241.5	216	25.5	8-Φ22.5	257
8"	200	495	343	298.5	270	29	8-Φ22.5	292
10"	250	622	406	362	324	30.5	12-Φ25	350
12"	300	698	483	432	381	32	12-Φ25	398
14"	350	787	533	476.8	413	35	12-Φ29	445
16"	400	864	597	539.8	470	37	16-Φ29	490
18"	450	978	635	577.8	533	40	16-Φ32	520
20"	500	978	698	635	584	43	20-Φ32	546
24"	600	1295	813	749.3	692	48	20-Φ35	880
NPS	DN	Class 300Lb
in	mm	L	D	D1	D2	b	Z-Φd	H

2"	50	267	165	127	92	22.5	8-Φ19	179.5
21/2"	65	292	190	150	105	25	8-Φ22	190
3"	80	318	210	168	127	29.0	8-Φ22.5	212.4
4"	100	356	254	200	157	32.0	8-Φ22.5	246
6"	150	445	317.5	269.7	216	37.0	12-Φ22.5	292
8"	200	533	381	330	270	41.5	12-Φ25.5	328
10"	250	622	444.5	387	324	48.0	16-Φ28.5	378.6
12"	300	711	521	451	381	51.0	16-Φ32	420
14"	350	838	584	514	54	54	20-Φ32	470
16"	400	864	648	572	57	57	20-Φ35	530
18"	450	978	711	629	60	60	24-Φ35	584
20"	500	1016	775	686	64	64	24-Φ35	610
24"	600	1346	914	813	70	70	24-Φ41	860
NPS	DN	Class 600Lb
in	mm	L	D	D1	D2	b	Z-Φd	H
2"	50	292	165	127	92	25	8-Φ19	203
21/2"	65	330	190	150	105	29	8-Φ22	229
3"	80	356	210	168	127	32	8-Φ22	235
4"	100	432	273	216	157	38	8-Φ25	286
6"	150	559	356	292	216	48	8-Φ29	330
8"	200	660	419	349	270	56	12-Φ29	381
10"	250	787	508	432	324	64	12-Φ32	457
12"	300	838	559	489	381	67	16-Φ35	584
14"	350	889	603	527	413	70	20-Φ38	635
16"	400	991	686	603	470	76	20-Φ41	684

Articles related to technology research and development

Slow-closing wafer check valve patent

The utility model provides a slow-closing wafer check valve, which includes a valve body, a valve disc, a valve shaft, and a torsion spring sleeved on the valve shaft. The valve body is provided with a medium channel for medium circulation in the axial direction, which includes an inlet end and an outlet end. The valve disc, valve shaft, and torsion spring are symmetrically arranged in two groups relative to the center of the valve body. The utility model further includes a damping device located at the inlet end, which includes a cylinder inserted on the valve body, a piston rod located inside the cylinder, a spring, and a cover connected to the outer end of the cylinder. The cylinder is provided with a first cavity and a second cavity that are connected and communicated. The cross-section of the second cavity is square, and its cross-sectional area is larger than that of the first cavity. One end of the piston rod located inside the medium channel is provided with a movable block. The utility model has low noise and technical characteristics of quick opening, slow closing, and water hammer elimination, enabling light-load pump start-up and preventing the generation of water hammer during pump shutdown.
1. A slow-closing wafer check valve, comprising a valve body, a valve disc, a valve shaft, and a torsion spring sleeved on the valve shaft. The valve body is provided with a medium passage for medium circulation in the axial direction, and the medium passage includes an inlet end and an outlet end. The valve disc, valve shaft, and torsion spring are symmetrically arranged in two groups relative to the center of the valve body. The valve also comprises a damping device located at the inlet end. The damping device includes a cylinder inserted on the valve body, a piston rod located inside the cylinder, a spring, and a cover connected to the outer end of the cylinder. The cylinder is provided with a first cavity and a second cavity that are connected and communicated. The cross-section of the second cavity is square, and the cross-sectional area of the second cavity is larger than that of the first cavity. One end of the piston rod is located inside the second cavity, and the other end penetrates through the first cavity and is located inside the medium passage. The end of the piston rod located inside the medium passage is provided with a movable block, and the end of the piston rod located inside the second cavity is provided with an external thread. The second cavity is provided with a limit plate that is adapted to and threadedly connected with the piston rod. The spring is sleeved on the piston rod, with one end abutting against the limit plate and the other end abutting against the inner wall of the second cavity. The side of the valve disc facing the piston rod is provided with a driving block that cooperates with the movable block. During the closing process of the valve disc, the side of the driving block facing the center of the valve body cooperates with the movable block to achieve displacement of the piston rod relative to the cylinder towards the center of the valve body. The damping device is symmetrically arranged in two groups relative to the center of the valve body.
2. A slow-closing wafer check valve according to claim 1, characterized in that a square hole is axially provided at the end of the piston rod located in the second cavity, an adjuster is inserted at a position on the cover corresponding to the square hole, a driving rod adapted to the square hole is provided at the end of the adjuster, and the adjuster is rotatable relative to the cover.
3. A slow-closing wafer check valve according to claim 2, characterized in that a limit slot is provided at the connection between the cover and the regulator, and a limit mechanism is arranged inside the limit slot. The limit mechanism comprises a ball, a tower spring connected to the ball, and a positioning column for fixing the tower spring. At least four engaging slots adapted to the ball are provided circumferentially at the connection between the regulator and the cover.
4. A slow-closing wafer check valve according to claim 3, characterized in that the top edge of the engaging groove is provided with a rounded corner.
5. A slow-closing wafer check valve according to claim 1, characterized in that the valve body is provided with a stepped groove adapted to the cylinder body.
6. A slow-closing wafer check valve according to claim 5, characterized in that a sealing ring is sleeved at the connection between the cylinder and the valve body.
7. A slow-closing wafer check valve according to claim 1, characterized in that the valve disc is provided with a build-up welding layer that is sealed with the valve body. 8. A slow-closing wafer check valve according to claim 7, characterized in that one side of the build-up welding layer is provided with vulcanized rubber that is sealed with the valve body.

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

API Check Valve

More API, JIS, DIN, GOST check valves>>

More check valve>>

More valve>>

API Check Valve