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KAI WEI XI CHAN PIN FEN LEI

H71W Wafer Check Valve
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Address：No. 1, Linxia Road, Sanqiao Industrial Zone, Oubei Street, Yongjia County, Zhejiang Province，china
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H71W Wafer Check Valve

Model：H71W-PN40C/H71W-16C/H71W-25C/H71W-16P/H71W-25P/H71W-40P
Specification：DN15-250
Temperature：≤ 120 ℃
Medium：Water and water-like media

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

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H71W Wafer Check ValveOverview

H71W Wafer Check Valve Overview

The H71W Wafer Check Valve is a compact and versatile check valve that employs a wafer-type connection. Unlike flanged valves, its body does not incorporate flanges and is instead installed between two pipeline flanges using long bolts. The valve body is typically constructed from materials such as stainless steel, carbon steel, or cast iron, and features an internal single-disc or dual-disc swing-type design.The valve operates by swinging open under forward medium flow and automatically closing under the disc’s own weight, often assisted by a spring, when the medium stops or reverses direction, thereby preventing backflow.Known for its lightweight design, short face-to-face length, and cost-effectiveness, this valve is widely used in space-constrained pipeline systems such as water treatment, HVAC, industrial circulating water, and pump discharge lines. It is suitable for general media including water, oil, and air.

H71W Wafer Check Valve Product Image

H71W Wafer Check ValveCharacteristic

H71W Wafer Check Valve Features

1. Compact Structure and Lightweight Design

The wafer-type design eliminates the need for valve body flanges, offering an extremely short face-to-face length and reduced overall weight. This significantly saves installation space and material costs, making it particularly suitable for densely arranged pipelines.

2. Cost-Effective and Easy Installation

The valve is simply clamped between two pipeline flanges using long bolts, enabling quick and straightforward installation without the need for mating flanges. This significantly reduces procurement and installation costs.

3. Low Flow Resistance and Reliable Sealing

The streamlined flow path design minimizes pressure loss. The disc closes rapidly, ensuring reliable sealing to effectively prevent medium backflow. Some models feature a dual-disc design to mitigate water hammer effects.

4. Relatively Simple Maintenance

With a relatively straightforward structure, the valve is easy to disassemble for maintenance or replacement without damaging the pipeline. Some dual-disc designs allow for online inspection and maintenance.

5. Application Scope and Limitations

Suitable for medium to low-pressure conditions (PN10 to PN40) with a typical operating temperature range of -29°C to 150°C. Not recommended for media containing large amounts of solid particles or high viscosity. During installation, ensure pipeline flanges are aligned parallel to each other.

H71W Wafer Check Valvestructure principle

H71W Wafer Check Valve Structure Diagram

Parts Name Material List

NO.	Name	Material
4	shaft	Carbon Steel, Stainless Steel
3	spring	Stainless Steel
2	disc	Carbon Steel+STL,Stainless Steel
1	body	Carbon Steel, Stainless Steel

H71W Wafer Check Valvetechnology parameter

Performance Specification
Nominal Pressure	1.6/2.5/4	Mpa
Shell Test	2.4/3.75/6
Seal Test	1.76/2.75/4.4
Suitable Temp.	≤425	℃

H71W Wafer 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.

H71W Wafer Check Valve View Drawing

H71W Wafer Check Valve Dimensions Table

主要连接尺寸Main connection dimensions							PN16-PN40
DN	15	20	25	32	40	50	65	80	100	125	150	200	250
L	16	19	22	28	31.5	40	46	50	60	90	106	140	160
D	52	62	72	83	93	109	129	144	164	194	220	275	332
D1	15	19	24	31	39	48	63	78	98	123	148	198	248
PN64-PN160
DN	15	20	25	32	40	50	65	80	100	125	150	. 200	. 250
L	25	31.5	35.5	40	45	56	63	71	80	110	125	160	180
D	62	73	83	89	104	114	138	148	174	211	248	310	362
D1	15	19	24	31	39	48	63	78	98	123	148	198	248

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

H71W Wafer Check Valve

More Lift Check Valve>>

More check valve>>

More valve>>

H71W Wafer Check Valve