300X Slow Closing Check Valve

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300X Slow Closing Check Valve

Categories: Water Valve Series

The 300X Slow Closing Check Valve is a hydraulic control valve designed to prevent water hammer in pipeline systems.

Performance and characteristics:

Product Overview

The 300X Slow Closing Check Valve is a hydraulic control valve designed to prevent water hammer in pipeline systems. It features an adjustable slow-closing mechanism that gradually shuts to eliminate pressure surges while maintaining reliable backflow prevention.

Key Features

Adjustable Closing Speed– 3-60 second closing time to prevent water hammer
Dual Function Design– Combines check valve and hydraulic control functions
Low Pressure Loss– Streamlined flow path design
Bubble-Tight Seal– Resilient seated disc prevents backflow
Corrosion Resistance– Stainless steel trim and epoxy coated body
Maintenance-Friendly– Top access design for easy servicing
Multi-Directional Installation– Suitable for horizontal or vertical pipes

Technical Specifications

Parameter	Specification
Size Range	DN50～DN600 (2″～24″)
Pressure Rating	PN10～PN25 (Class 150～300)
Temperature Range	0℃～80℃ (standard), -20℃～120℃ (extended)
Closing Time	3-60 seconds (adjustable)
Cracking Pressure	0.01～0.05MPa
Connection Types	Flanged (RF/FF), Wafer, Lug
Body Material	Ductile Iron (GGG50), Cast Steel, Stainless Steel
Disc Material	Stainless Steel (304/316) with EPDM/NBR sealing
Control System	Hydraulic damping cylinder with adjustable needle valve
Test Standards	API 598, EN 12266, ISO 5208

Working Principle

The 300X valve operates through a hydraulic damping system. When forward flow begins, the disc opens freely. When flow stops or reverses, the hydraulic control system engages, slowly closing the disc at an adjustable rate. The closing speed is controlled by a needle valve that regulates oil flow in the damping cylinder, allowing precise adjustment to system requirements.

Structural Features

Hydraulic Damping Cylinder– Provides smooth, controlled closing
Adjustment Knob– External access for closing time adjustment
Spring-Assisted Opening– Ensures quick response to forward flow
Guide System– Maintains proper disc alignment
Inspection Port– Allows visual verification of disc position

Applications

Water supply and distribution systems
Pump discharge lines
HVAC chilled/hot water systems
Fire protection systems
Industrial process piping
Power plant cooling systems

Installation & Maintenance

Installation Requirements

Install with flow direction matching valve arrow
Provide adequate straight pipe runs (5D upstream, 2D downstream)
Support piping properly to avoid stress on valve body
Adjust closing time according to system requirements
For vertical installation, ensure proper orientation (consult manual)

Maintenance

Check hydraulic oil level annually
Test closing time every 6 months
Inspect disc and seat for wear during system shutdowns
Lubricate adjustment mechanism yearly
Verify proper operation after system pressure changes

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