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KAI WEI XI CHAN PIN FEN LEI

H74H Wafer Swing Check Valve
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Address：No. 1, Linxia Road, Sanqiao Industrial Zone, Oubei Street, Yongjia County, Zhejiang Province，china
Website：https://www.kaiweixi.com

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H74H Wafer Swing Check Valve

Model：H74H-10C/H74H-16C/H74H-25C/4H74H-0C/H74H-16P/H74H-25P/H74H-40P
Specification：DN50-DN600
Temperature：≤ 425 ℃
Medium：Water and water-like media

Pressure：PN10,PN16,PN25,PN40
Connection method：Wafer
Driving method：automated
Material：Carbon Steel, Stainless Steel

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H74H Wafer Swing Check ValveOverview

H74H Wafer Swing Check Valve Overview

The H74H Wafer Swing Check Valve is a high-performance check valve featuring a wafer-type connection and a metal hard-seal design for both the body and disc. The valve body is clamped between two pipeline flanges using long bolts, while the internal disc operates by swinging around a fixed pivot to open and close.Constructed from high-temperature-resistant alloy materials with specially hardened sealing surfaces, the valve maintains reliable sealing performance even under demanding conditions such as high temperatures, high pressures, and media containing particles.

The valve opens under forward medium flow and closes rapidly under the disc’s own weight and reverse pressure during backflow. Designed specifically for industrial systems such as petrochemical plants, power stations, and high-temperature steam applications, it is an ideal choice for pipelines with strict installation space limitations and high requirements for check valve performance.

H74H Wafer Swing Check Valve Product Image

H74H Wafer Swing Check ValveCharacteristic

H74H Wafer Swing Check Valve Features

1. Compact Structure and High Pressure-Bearing Capacity

The wafer-type design offers a short face-to-face length and minimal space occupancy. Its metal hard-seal structure enables it to withstand higher system pressures and temperatures, making it suitable for high-pressure differential applications.

2. Metal Hard Seal with Wear Resistance

The disc and seat feature overlay-welded hard alloy or stainless steel sealing surfaces, providing excellent resistance to erosion, high temperatures, and wear. This ensures a long service life, particularly for media containing trace solid particles.

3. Easy Installation and Cost Savings

No need for valve body mating flanges; the valve is directly clamped between pipeline flanges using long bolts, simplifying and speeding up installation while significantly reducing material costs and installation space requirements.

4. Flexible Operation and Low Pressure Loss

The swing-type design allows the disc to swing almost completely away from the flow path when open, resulting in minimal fluid resistance and pressure loss. Rapid closure effectively mitigates water hammer effects.

5. Easy Maintenance and High Reliability

The simple and robust structure ensures ease of maintenance. When inspection or repair is needed, the valve can be removed simply by loosening the connecting bolts, eliminating the need for pipeline disassembly and reducing maintenance complexity and downtime.

H74H Wafer Swing Check Valvestructure principle

H74H Wafer Swing Check Valve Structure Diagram

Parts Name Material List

NO.	Name	Material
3	seal surface	NBR、EPDM、PTFE、stainless steel
2	disc	Carbon Steel + STL, Stainless Steel
1	body	Carbon Steel , Stainless Steel

H74H Wafer Swing Check Valvetechnology parameter

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

H74H Wafer Swing Check Valvestandard size

Dimensions Standard Requirements

1. The structural length of the valve shall conform to the standard GB/T 12221.

2. The connecting flange shall conform to the standard GB/T 17241.6.

H74H Wafer Swing Check Valve View Drawing

H74H Wafer Swing Check Valve Dimensions Table

SIZE	D	L		D
SIZE	D	I型	II型	PN1.0	PN1.6	PN2.5	PN4.0
50	25	15	22	109	109	109	109
65	38	15	22	129	129	129	129
80	46	15	22	144	144	144	144
100	72	15	24	164	164	170	170
125	95	16	26	194	194	186	186
150	114	19	29	221	221	226	226
200	140	29	43	275	275	283	293
250	188	29	43	330	331	343	355
300	216	38	50	380	386	403	420
350	263	41	52	440	446	460	477
400	305	51	62	491	498	517	549
450	356	51	62	541	558	567	574
500	406	65	80	596	620	627	613
600	482	70	90	698	737	734	750

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

H74H Wafer Swing Check Valve

More Swing check valve>>

More check valve>>

More valve>>

H74H Wafer Swing Check Valve