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