Gaoshan Valve – H76H / H76W Wafer Double Disc Swing Check Valve

Model Series: H76H-16C/25/40, H76W-16P/25P/40P, H76W-16R/25R/40R | Pressure Class: PN10~PN40 | Connection: Wafer
H76H/H76W wafer double disc swing check valve is a compact anti-backflow valve designed for industrial pipelines. With dual-disc swing structure and spring-assisted quick closing, it effectively prevents medium backflow, reduces water hammer pressure, and is suitable for water, steam, oil, nitric acid, acetic acid and other corrosive media. Ideal for water treatment, environmental protection, high-rise building water supply and drainage systems.

✅ Core Features & Advantages

• Ultra-Compact & Lightweight Design: Structure length is only 1/4~1/8 of traditional flanged check valves, and weight is only 1/4~1/20, saving installation space and reducing pipeline load.
• Dual-Disc Quick Closing Mechanism: Dual-disc design with spring assistance enables fast closing, effectively reducing water hammer pressure and pipeline impact.
• Low Fluid Resistance & High Efficiency: Smooth flow path design minimizes fluid resistance, with flexible disc movement and reliable sealing performance.
• Flexible Installation Options: Suitable for both horizontal and vertical pipeline installation, adapting to various working conditions and pipeline layouts.
• Multi-Material Configuration: Available in 2Cr13, 1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti materials, suitable for corrosive media like nitric acid and acetic acid.
• Long Service Life & High Reliability: Simple and compact structure, few moving parts, low maintenance requirements, suitable for long-term stable operation in industrial systems.

📊 Performance Specifications

Model	Nominal Pressure (MPa)	Shell Test Pressure (MPa)	Seal Test Pressure (MPa)	Working Temperature (℃)	Applicable Medium
H76H-16C / H76H-25 / H76H-40	1.6 / 2.5 / 4.0	2.4 / 3.8 / 6.0	1.8 / 2.8 / 4.4	≤425	Water, Steam, Oil
H76W-16P / H76W-25P / H76W-40P	1.6 / 2.5 / 4.0	2.4 / 3.8 / 6.0	1.8 / 2.8 / 4.4	≤425	Nitric Acid Corrosive Media
H76W-16R / H76W-25R / H76W-40R	1.6 / 2.5 / 4.0	2.4 / 3.8 / 6.0	1.8 / 2.8 / 4.4	≤425	Nitric Acid Corrosive Media

🛠️ Main Component Materials

Component	H76H Series	H76W-P Series	H76W-R Series
Valve Body	2Cr13	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti
Valve Disc	1Cr18Ni9Ti	1Cr18Ni9Ti	1Cr18Ni12Mo2Ti

📐 Main Dimensions & Weights (PN10~PN40)

DN (mm)	L (mm)	D (mm)	Weight (kg)
50	60	109	1.8~2.4
65	67	129	2.6~3.8
80	73	144	4.2~5.6
100	83	164~170	5.2~7.5
125	98	194~198	6.7~11.0
150	98	220~228	9.4~15.0
200	127	275~293	18.7~27.0
250	146	333~355	29.4~48.0
300	181	388~420	48.5~78.0
350	184~222	448~480	66.0~116.0
400	198~232	498~549	90.0~152.0

*Dimensions are for reference only. Contact us for complete drawings for your specific model.

📝 Design & Manufacturing Standards

• Design Standard: API 594, API 6D, JB/T 8937
• Face-to-Face Dimensions: GB/T 12221, ISO 5752, API 594, DIN 3202
• Flange Standards: GB/T 1724.1, GB/T 9113~9124, ANSI B 16.5, DIN 2543~2548
• Testing & Inspection: API 598, JB/T 9092

⚙️ Installation & Maintenance Guidelines

• Installation Requirements: Wafer type connection, clamped between two pipeline flanges. Do not let the check valve bear the weight of the pipeline; large-caliber valves need independent support.
• Flow Direction: Install the valve with the medium flow direction matching the arrow marked on the valve body.
• Mounting Configuration: Suitable for both horizontal and vertical pipeline installation, with flexible dual-disc structure ensuring reliable operation in different orientations.
• Routine Maintenance: Regularly inspect the valve body, discs, springs and sealing surfaces for wear or damage. Keep the pipeline free of debris to prevent jamming, ensuring stable anti-backflow performance.