Hydraulically controlled slow closing check valves

Butterfly check valve is suitable for water, sewage, oil and gas and other media, widely used in municipal water supply and drainage, chemical industry, fire fighting and HVAC systems. Its structure is compact, rapid opening and closing, suitable for low-pressure working conditions, the working temperature is generally 0 ℃ to 150 ℃. The valve plate realizes one-way control of medium flow direction through rotation, prevents backflow and protects the safety of pipeline network. Valve body materials commonly used include ductile cast iron, stainless steel and carbon steel, sealing materials are mostly rubber or fluorine plastic, with good corrosion resistance and sealing performance, easy maintenance and long service life.
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Hydraulically controlled slow closing check valves

Hydraulically controlled slow closing check valves

Model: HD742X, HD743H
Subtitle: Large caliber intelligent waterproof hammer hydraulic check valve
The Pilot Operated Slow Closing Check Valve is a high performance intelligent valve designed for large water supply, power generation and industrial systems. Developed by our company based on decades of experience and advanced technology, the valve integrates mechanical, hydraulic and electrical systems to provide precise flow control, water hammer protection and energy savings.
Tags:Water Hammer Elimination Check Valve
Classification:Butterfly Check Valve
Working conditions:power plants, waterwork, water treatment plant
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Product Overview

The Pilot Operated Slow Closing Check Valve is a high performance intelligent valve designed for large water supply, power generation and industrial systems. Developed by our company based on decades of experience and advanced technology, the valve integrates mechanical, hydraulic and electrical systems to provide precise flow control, water hammer protection and energy savings.

Available in two control system types - standard hydraulic accumulator and locking hydraulic accumulator - the valve is widely used in water treatment plants, power stations, steel mills and chemical plants. It combines the functions of a check valve and a gate valve with reliable sealing, low flow resistance and intelligent control.

Applicable working conditions

Water supply systems: Installed at pump discharge points in water treatment plants, municipal water supply networks and irrigation systems.

Power generation: for turbine inlets in hydroelectric power plants and pump outlets in thermal power plant cooling systems.

Industrial piping: for non-corrosive gas and flue gas piping and process water systems.

Product Characteristics

Intelligent control system: Integrated hydraulic and electrical control systems for local and remote operation. Compatible with Distributed Control System (DCS) for centralized management and linked operation of pumps, turbines and bypass valves. Manual operation in case of power failure or emergency.

Adjustable Closing Speed: Hydraulic system allows precise adjustment of opening and closing times (5-120 seconds). Two stages of closure (fast and slow) effectively eliminate water hammer and protect piping and equipment.

Advanced Seal Design: Triple Eccentric Metal Seal: For high temperature applications, with stainless steel and graphite layers for long lasting durability and no leakage.

Double eccentric rubber seals: zero leakage and easy to replace. Streamlined valve design reduces flow resistance (flow coefficient: 0.1-0.6).

Space and cost savings: Combines the functions of a check valve and a gate valve to reduce installation space and infrastructure costs.

User-friendly interface: Multiple control options: push-button based, text-based or touch-screen interface. Interface can be customized to meet specific customer needs.

Structural characteristics

Valve Body: Horizontal design, long stem or half-length stem configuration.

Sealing Options: Triple Eccentric Metal Seal: Stainless steel and graphite layer for high temperature applications. Double Eccentric Rubber Seal: Zero leakage and easy to replace.

Hydraulic system: Includes oil pumps, hydraulic blocks, solenoid valves, flow control valves and accumulators. Two accumulators provide backup power for valve operation.

Hand pump for emergency operation.

Actuator: Hydraulic cylinder and linkage system to ensure smooth operation. Fast and slow closing speeds can be adjusted by means of a flow control valve.

Installation and commissioning

Installation: Install at least 2 meters from the pump outlet to minimize turbulence. Ensure that the valve is level and well supported to avoid axial thrust on the piping.

Commissioning: Verify manual operation and electrical connections. Adjust opening and closing speeds using flow control valves. Set pressure limits (KP1: 8 MPa, KP2: 14 MPa) and check for leaks.

 

Operation and Control

Local control: open, close or stop the valve in any position using the control panel. Opening and closing speeds are regulated by hydraulic valves.

Remote control: Integration with DCS for automated operation of pumps or turbines. Supports synchronized or delayed startup of valves and pumps.

MANUAL OPERATION: Use a hand pump to operate the valve in the event of a power failure or emergency.

fault resolution

concernrationaleprescription
seal leakageLoose screws or worn sealsTighten screws or replace seals
unopenIncorrect motor steering or clogged valvesAdjust motor steering or clear blockage
No automatic pressure maintenancePressure switch malfunctionAdjust or replace pressure switch
Pumps run too longClogged filters or hydraulic leaksClean filters or fix leaks

Medium of use

Water/hot water

working condition

power plants, waterwork, water treatment plant

summarize

The Hydraulically Controlled Slow Closing Check Valve is a versatile, high-performance solution for preventing backflow and eliminating water hammer in large systems. Its intelligent control system, durable construction and customizable features make it ideal for water supply, power generation and industrial applications. The valve combines advanced technology with user-friendly operation to ensure reliable performance and long-term system protection.

Product Parameters

Nominal diameterDN300 to DN4000 (12" to 160")
Nominal pressurePN0.25 to PN4.0 (0.25-4.0 MPa)
test pressureShell: 1.5×PNSeal: 1.1×PN
operating temperature≤80°C
Applicable mediumFreshwater, seawater, mud, oil and non-corrosive gases
drive timeDN<1000 mm: 15-60 secDN≥1000-4000 mm: 30-120 sec
Fast closing timeFast closing: DN<1000 mm: 5-30 seconds DN≥1000-4000 mm: 10-40 seconds
Slow closing timeSlow closing: DN<1000 mm: 10-60 seconds DN≥1000-4000 mm: 20-90 seconds
Material body:Carbon steel, cast iron, ductile iron
Valve materialCarbon steel, cast iron, ductile iron
Stem MaterialStainless steel, carbon steel
Seal MaterialStainless steel/copper alloy (metal), NBR rubber (soft)

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