Gaoshan Valve – H7B41X Hydraulic Control Check Valve

Model Series: H7B41X-16 / H7B41X-16C | Pressure Class: PN16 | Connection: Flanged
H7B41X hydraulic control check valve is a normally closed automatic valve designed for normal pressure boiler return water pipelines. Controlled by pipeline pressure changes, it opens and closes automatically to prevent boiler overflow caused by pump shutdown, effectively replacing expensive electromagnetic control systems. Ideal for water and oil medium pipelines.

✅ Core Features & Advantages

• Pressure-Controlled Automatic Operation: Opens and closes based on pipeline pressure changes, eliminating the need for external power or complex control systems.
• Normally Closed Safety Design: Prevents boiler overflow caused by sudden power outages or circulating pump shutdown, ensuring system safety.
• Cost-Effective Alternative: Replaces expensive electromagnetic control systems, reducing overall project costs while maintaining reliable performance.
• Multiple Body Material Options: Available in gray cast iron (H7B41X-16) and WCB cast steel (H7B41X-16C) to suit different working conditions.
• Durable Construction: 2Cr13 stainless steel valve disc and seat with 50CrVA spring for long service life and reliable sealing.
• Simple & Compact Structure: Easy to install and maintain, specially designed for normal pressure boiler return water systems.

📊 Performance Specifications

Model	Nominal Pressure (MPa)	Shell Test Pressure (MPa)	Seal Test Pressure (MPa)	Working Temperature (℃)	Applicable Medium
H7B41X-16 / H7B41X-16C	1.6	2.4	1.8	≤70	Water, Oil

🛠️ Main Component Materials

Component	H7B41X-16	H7B41X-16C
Valve Body / Bonnet	Gray Cast Iron	WCB Cast Steel
Valve Stem / Disc / Seat	2Cr13 Stainless Steel	2Cr13 Stainless Steel
Spring	50CrVA Alloy Steel	50CrVA Alloy Steel

📐 Main Dimensions & Weights (PN16)

DN (mm)	Face-to-Face L (mm)	Height H (mm)	Height H1 (mm)	Weight (kg)
40	220	175	115	28
50	250	175	115	28
65	280	195	135	34
80	310	215	155	40
100	350	215	155	49
125	400	240	170	78
150	450	240	170	111
200	500	280	190	155

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

📝 Design & Manufacturing Standards

• Design Standard: GB/T 12235
• Face-to-Face Dimensions: GB/T 12221
• Flange Standards: GB/T 9113, JB/T 79
• 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; large-caliber valves need independent support to avoid pipeline stress impact.
• Flow Direction: Install the valve with the medium flow direction matching the arrow marked on the valve body.
• Mounting Configuration: Vertical lift disc check valves must be installed on vertical pipelines; horizontal lift disc check valves must be installed on horizontal pipelines.
• Routine Maintenance: Regularly inspect the valve body, sealing surfaces, and spring for wear or damage to ensure reliable operation. Keep the pipeline free of debris to prevent jamming.