Gaoshan Valve – H42H Vertical Lift Check Valve

Model Series: H42H-25Q / H42H-25 | Pressure Class: PN25 | Connection: Flanged
H42H vertical lift check valve is an automatic anti-backflow valve designed for vertical/horizontal pipelines. With spring-supported disc design, it opens under medium pressure and closes automatically to prevent reverse flow, protecting pumps and equipment. Ideal for water, steam, oil and weak corrosive media in petroleum, chemical, pharmaceutical and power industries.

✅ Core Features & Advantages

• Dual Installation Options: Supports both vertical and horizontal mounting. Vertical installation can omit the spring (relying on disc weight for closure), while horizontal installation requires a spring for reliable shut-off.
• Spring-Supported Disc Design: Short disc stroke, fast closing response, effectively reducing water hammer pressure and pipeline impact.
• Durable Metal Hard Seal: Disc and seat are made of 2Cr13 stainless steel, with optional hard alloy overlay for excellent wear resistance, high temperature resistance and corrosion resistance.
• Multi-Material Body Options: Available in ductile iron (H42H-25Q) and WCB cast steel (H42H-25) bodies to suit different temperature conditions (≤300℃ / ≤425℃).
• Simple & Lightweight Structure: Fewer parts, compact design, good manufacturability and easy maintenance.
• Reliable Anti-Backflow Performance: Automatically opens and closes based on medium pressure, ensuring one-way flow protection for pipelines.

📊 Performance Specifications

Model	Nominal Pressure (MPa)	Shell Test Pressure (MPa)	Seal Test Pressure (MPa)	Working Temperature (℃)	Applicable Medium
H42H-25Q	2.5	3.8	2.8	≤300 (Ductile Iron)	Water, Steam, Oil
H42H-25	2.5	3.8	2.8	≤425 (Cast Steel WCB)	Water, Steam, Oil

🛠️ Main Component Materials

Component	H42H-25Q	H42H-25
Valve Body / Bonnet / Disc / Seat	Ductile Iron	WCB Cast Steel
Disc / Seat Sealing Surface	2Cr13 Stainless Steel	2Cr13 Stainless Steel

📐 Main Dimensions & Weights (PN25)

DN (mm)	Face-to-Face L (mm)	Weight (kg)
40	200	9.5
50	230	14
65	290	17
80	310	26
100	350	37
125	400	60
150	480	90
200	495	150

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

📝 Design & Manufacturing Standards

• Design Standard: GB/T 12235, API 6D
• Face-to-Face Dimensions: GB/T 12221, ASME B16.10
• Flange Standards: JB/T 79, ASME B16.5
• Testing & Inspection: GB/T 13927, JB/T 9092

⚙️ Installation & Maintenance Guidelines

• Installation Requirements: Do not let the check valve bear the weight of the pipeline; install independent supports for large-caliber valves.
• Flow Direction: Install the valve with the medium flow direction matching the arrow marked on the valve body.
• Mounting Configuration: Vertical installation can omit the spring (relying on disc weight for closure); horizontal installation must use a spring for reliable shut-off.
• Maintenance Tips: Regularly inspect the sealing surfaces for wear and tear to ensure stable anti-backflow performance. Keep the valve body clean and free from debris.