Products Description
The Hydraulically Controlled Slow-closing Check Butterfly Valve is a multifunctional integrated pipeline protection valve that combines the functions of a check valve, cut-off valve and buffer protection valve. It adopts hydraulic driving and counterweight-assisted structure to realize automatic opening with pump start-up and delayed slow closing during pump shutdown. Featuring a unique two-stage closing mode, the valve closes quickly for the main stroke and slowly for the final sealing stroke, which effectively eliminates water hammer, prevents medium backflow, and protects pipelines, water pumps and auxiliary equipment from pressure impact and damage. Compact, lightweight and highly reliable, this valve simplifies pipeline installation and replaces traditional complex valve combinations, making it a core protective component for water supply, power and industrial piping systems.
Core Product Advantages
Effective Water Hammer Elimination
Adopts professional two-stage slow-closing design to release pipeline pressure steadily, greatly reducing water hammer impact and avoiding pipe cracking and equipment damage caused by sudden pressure changes.
Integrated Multi-functional Design
Integrates check, shut-off and buffer protection functions in one valve, replacing the traditional combination of gate valve and check valve. It simplifies pipeline layout, saves installation space and reduces overall project cost.
Stable & Reliable Hydraulic Control System
Equipped with a precise hydraulic control mechanism, the valve realizes automatic opening and delayed closing without extra electric control. It operates sensitively, responds quickly and adapts to long-term continuous working conditions.
Durable Structure & Low Maintenance
Optimized body structure with high-strength casting and reliable sealing performance. It features stable operation, strong fatigue resistance and low failure rate, minimizing daily maintenance and replacement frequency.
Working Principle
When the water pump starts, the medium pressure pushes the valve disc to open automatically, allowing smooth fluid circulation. When the pump stops working and the pipeline pressure drops, the hydraulic control system and counterweight device work together to control the closing process. The valve first completes fast closing for most of the stroke to block most backflow, then switches to slow closing for the final section to stabilize pipeline pressure. This scientific staged closing principle perfectly avoids instantaneous high pressure and water hammer hazards, ensuring safe and stable pipeline operation.
Product Features
Product Features
Two-stage slow-closing design for anti-water hammer protection
Automatic opening and closing with pump operation, no manual intervention required
Compact structure, light weight and easy installation
Excellent sealing performance, zero backflow and low leakage
Strong adaptability for long-term high-frequency operation
Available for customized closing time and pressure grades
Certifications
ISO certification is far more than just an entry-level qualification for our enterprise. It serves as all-round proof of our product quality, regulatory compliance and core market competitiveness, guiding our strategic upgrade from basic low-end manufacturing to standardized high-end production management.
Company Profile
As a top producer of premium hydraulic control valves and flow control solutions, SND holds international patents and carries out technical cooperation programs. We rigorously implement ISO 9001 quality control to manufacture zero-defect valves and build our reputation as an industry benchmark.
Equipped with automated production lines and unified systematic management, our products gain official recognition from national construction authorities in China. Relying on our countrywide sales & service coverage, we pursue sustained innovation to develop advanced valve technologies, delivering reliable, high-efficiency flow control solutions competitive on the world stage.
Products Description
FAQ
Q: What is the main function of this valve?
A: This valve integrates check valve, shut-off valve and buffer protection functions in one unit. It automatically opens with pump operation and closes slowly when the pump stops, effectively preventing medium backflow and eliminating water hammer to protect pipelines and water pumps.
Q: How does the two-stage slow-closing work?
A: It adopts a scientific dual-stage closing design. Most of the valve stroke closes quickly to block backflow in a short time, while the final sealing stroke closes slowly. This greatly reduces instantaneous pipeline pressure and avoids water hammer damage.
Q: What media is this valve suitable for?
A: It is mainly used for clean water, raw water, circulating water and other conventional liquid media. It is widely applicable for water supply, drainage, pumping stations and industrial circulating water systems.
Q: What are the advantages compared with traditional valve combinations?
A: It replaces the traditional matching installation of gate valve and check valve. It simplifies pipeline layout, saves installation space, reduces overall project cost, and features more stable operation and lower failure rate.
Q: What size and pressure levels are available?
A: We support large-diameter specifications from DN200 to DN2000, with common pressure grades including PN10, PN16 and PN25. Customized sizes and pressure standards are available upon request.
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