Product Introduction

The Low Speed Closed Check Valve is a precision-engineered automatic valve system designed to optimize pump operation and protect pipeline infrastructure. Composed of a main valve, check valve, needle valve, ball valve, and pressure gauge, this integrated hydraulic control system delivers dual functionality: reliable backflow prevention and adjustable opening/closing speed regulation.

Unlike conventional check valves, its core advantage lies in adaptive speed control-when installed at pump outlets, it automatically adjusts to the optimum opening and closing pace during pump startup and shutdown. This intelligent operation relies entirely on hydraulic self-control, eliminating the need for external power or complex actuators, while the built-in pressure gauge enables real-time system monitoring for enhanced operational visibility. Engineered to comply with international standards such as API 594 and GB/T 12235, it ensures compatibility with global industrial systems.

Key Features

Dual-Stage Closing Technology

The valve disc implements a "quick-close first, slow-close final" sequence, effectively eliminating destructive water hammer that commonly occurs during pump shutdown-critical for preventing pipeline rupture and equipment damage.

Medium-Independent Performance

The slow-closing system operates reliably regardless of pipeline medium type, including water, sewage, oil, and gas, making it versatile across industries.

Silent & Smooth Operation

Equipped with rubber buffers and soft seals, it minimizes vibration and noise during operation, addressing noise pollution concerns in residential and commercial areas.

Energy-Efficient Design

The full-channel, streamlined valve body reduces flow resistance by up to 30% compared to traditional check valves, lowering pump energy consumption significantly.

Long-Term Durability

Wear-resistant rubber seals and corrosion-resistant materials (carbon steel, stainless steel, alloy steel) ensure a prolonged service life even in harsh operating environments.

Adjustable Timing

Slow closing time can be calibrated between 3 to 60 seconds to match specific system requirements, providing customized protection.

Application Scenarios

Water Supply Systems

Ideal for high-rise building water supply networks and urban water projects, where it prevents backflow and safeguards booster pumps.

Wastewater Treatment

Protects sewage pumps and treatment equipment from backflow damage in municipal and industrial wastewater facilities.

Industrial Circulation

Used in cooling water systems for manufacturing plants and power generation facilities to maintain unidirectional flow and prevent equipment overheating.

Oil & Gas Sector

Suitable for crude oil and natural gas pipelines, complying with API 6D standards to ensure safe, leak-tight operation.

Fire Protection

Enhances reliability in fire sprinkler systems by ensuring rapid yet controlled valve response during emergency pump activation.

FAQ

Q1: How does the Low Speed Closed Check Valve prevent water hammer?

A1: It utilizes a hydraulic control system to regulate closure speed-first closing the valve disc quickly to block reverse flow, then slowing the final closure phase to dissipate pressure surges. This dual-stage action eliminates the "water hammer" effect caused by sudden valve slamming.

Q2: Does the valve require external power or manual operation?

A2: No. It operates automatically using the pressure of the pipeline medium itself. The integrated needle valve and ball valve allow pre-setting of speed parameters, after which no manual intervention or external energy is needed.

Q3: What media and temperature ranges can it handle?

A3: It is compatible with water, sewage, oil, gas, and other common industrial media. Temperature resistance ranges from -29℃ to 538℃, with pressure ratings spanning PN 16 to PN 420 (Class 150 to Class 2500).

Q4: How do I maintain the valve?

A4: Routine maintenance is minimal. Periodically inspect the pressure gauge for accuracy, clean the built-in micro-filter (where equipped) to prevent clogging, and replace rubber seals every 2-3 years depending on usage frequency.

Q5: What sizes are available?

A5: The valve is offered in nominal diameters from DN 15 to DN 1000 (NPS 2 to NPS 40), with large-diameter models (DN 2400+) available for municipal water mains and industrial pipelines.

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