Gaoshan Valve — H71H / H71W Wafer Lift Check Valve

Model: H71H / H71W | Pressure: PN16–PN40 | Connection: Wafer (Between Flanges) | DN Range: DN15–DN150 | Installation: Vertical & Horizontal

Pressure Class

PN16 / PN25 / PN40

DN Range

DN15–DN150

Body Material

2Cr13 Stainless Steel

Max. Temperature

≤425°C

Connection Type

Wafer (Between Flanges)

Installation Orientation

Vertical & Horizontal

Water
Steam
Oil & Petroleum
Nitric Acid
Acetic Acid
Corrosive Media

Core Strengths

Ultra-Compact Wafer Design

Extremely slim profile designed to fit between standard flanges without additional gaskets or bolts. Saves significant pipeline space compared to flanged check valves—ideal for space-constrained installations.

Rapid Closure & Low Water Hammer

Lightweight disc closes quickly when flow stops, minimizing water hammer pressure spikes in pump discharge lines. The low-inertia design ensures fast response while maintaining smooth operation.

Minimal Flow Resistance

Streamlined internal flow path with low-pressure drop characteristics. The wafer body profile reduces turbulence and energy loss, improving overall system efficiency in continuous-flow applications.

Dual Installation Flexibility

Can be installed on both vertical pipelines and horizontal pipelines without modification. The guided disc mechanism functions reliably in either orientation—simplifies system design and inventory management.

Triple Material Options for Corrosion Service

Available in 2Cr13 carbon steel (water, steam, oil), 1Cr18Ni9Ti austenitic stainless steel (nitric acid), and 1Cr18Ni12Mo2Ti molybdenum stainless steel (severe corrosive media including acetic acid).

Simple Structure & Easy Maintenance

All-metal construction with minimal moving parts. No springs, bearings, or external actuators required—the self-guiding disc mechanism delivers reliable performance with near-zero maintenance overhead.

Product Overview

The H71H / H71W wafer lift check valve is an ultra-slim non-return valve engineered to install directly between two pipe flanges using the existing flange bolt sets—eliminating the need for separate mounting hardware or extended face-to-face space. The valve features an all-stainless steel body and disc assembly, with the disc lifting vertically along precision guides when forward flow pressure overcomes gravity, and dropping shut by its own weight when flow stops or reverses. This lightweight, low-inertia disc mechanism ensures rapid closure with minimal water hammer effect, making it particularly well-suited for pump protection applications where space is at a premium. The series covers three pressure classes (PN16, PN25, PN40) across DN15 through DN150, with three material grades available: 2Cr13 for general water, steam, and oil service up to 425°C; 1Cr18Ni9Ti for nitric acid environments; and 1Cr18Ni12Mo2Ti for highly corrosive media including acetic acid. Both vertical and horizontal installation orientations are fully supported.

Performance Specifications

Parameter	PN16	PN25	PN40
Model (Carbon Steel)	H71H-16C	H71H-25	H71H-40
Model (Stainless 304)	H71W-16P	H71W-25P	H71W-40P
Model (Stainless 316)	H71W-16R	H71W-25R	H71W-40R
Nominal Pressure (MPa)	1.6	2.5	4.0
Shell Test Pressure (MPa)	2.4	3.8	6.0
Seal Test Pressure (MPa)	1.8	2.8	4.4
Max. Working Temperature	≤425°C
Body Material	2Cr13 / 1Cr18Ni9Ti / 1Cr18Ni12Mo2Ti Stainless Steel

Material Selection Guide

Material Grade	Valve Body	Disc	Best Suited For
2Cr13 (Carbon Steel)	2Cr13	2Cr13	Water, Steam, Oil, Petroleum
1Cr18Ni9Ti (AISI 304)	1Cr18Ni9Ti	1Cr18Ni9Ti	Nitric Acid Environments
1Cr18Ni12Mo2Ti (AISI 316)	1Cr18Ni12Mo2Ti	1Cr18Ni12Mo2Ti	Nitric Acid, Acetic Acid, Severe Corrosive Media

Main Dimensions & Weights

DN (mm)	PN10 / PN16			PN25			PN40
DN (mm)	L (mm)	D (mm)	Weight (kg)	L (mm)	D (mm)	Weight (kg)	L (mm)	D (mm)	Weight (kg)
15	16	53	0.3	16	53	0.3	16	53	0.3
20	19	63	0.5	19	63	0.5	19	63	0.5
25	22	73	0.7	22	73	0.7	22	73	0.8
32	28	84	1.2	28	84	1.2	28	84	1.3
40	32	94	1.5	32	94	1.5	32	94	1.8
50	40	109	2.2	40	109	2.2	40	109	2.6
65	46	129	3.1	46	129	3.1	46	129	3.6
80	50	144	4.0	50	144	4.0	50	144	4.8
100	60	164	5.2	60	170	5.2	60	170	5.9
125	90	194	8.6	90	198	8.6	90	198	9.8
150	106	220	11.6	106	228	11.6	106	228	13.6

* L = Face-to-Face Length, D = Outer Diameter. All values are for reference only. Contact us for detailed drawings for your specific model.

Structure Drawing

Design & Manufacturing Standards

Design Standard: GB/T 12236
Face-to-Face Dimensions: GB/T 12221
Flange Standards: GB/T 9113, JB/T 79, HG/T 20592
Testing & Inspection: GB/T 13927, JB/T 9092
Applicable International Standards: EN 13709, EN 558, API 594 (optional)

Installation & Maintenance Guidelines

Wafer Mounting: Install the valve between two flanges using the same bolt set. Ensure proper alignment of the valve bore with the pipeline centerline. Use appropriate gaskets on each side of the valve body for reliable sealing.
Flow Direction: Install the valve with the correct orientation as indicated by the flow direction arrow marked on the valve body. Reverse flow direction will cause the valve to malfunction.
Flexible Orientation: This valve can be installed on both vertical and horizontal pipelines without affecting performance. For vertical installations, ensure medium flows upward for optimal disc action.
Bolt Torque Sequence: Tighten flange bolts gradually in a star pattern to avoid uneven compression on the wafer body. Over-tightening can distort the thin-profile body and affect disc movement.
Maintenance: Periodically inspect the guided disc and seat surface for wear or corrosion. Clean the guide passages to ensure free disc travel. Replace the valve if excessive scoring or deformation is observed on sealing surfaces.

Application Fields

Water Supply Systems
Steam Distribution Networks
Chemical Processing Plants
Petroleum Refineries
HVAC & Heating Systems
Pharmaceutical Industry
Food & Beverage Processing
Marine Applications

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