Definition:
High-pressure check valve is a kind of automatic opening and closing valve through the pressure of the medium's own flow, used to prevent the medium from flowing backwards, protect equipment (such as pumps, drive motors) from damage by reversing, and to avoid the leakage of the medium in the container.
Alias: backstop valve, check valve, backflow valve, back pressure valve.
Core function:
One-way flow control: only allow the medium to flow in one direction, blocking the reverse backflow.
High-pressure system protection: in the high-pressure pipeline to prevent abnormal pressure rise caused by system failure (such as auxiliary system overpressure supply).
Working principle and structural features
Working principle:
Medium forward flow: fluid pressure to promote the valve flap (such as rotary valve flap or lifting valve flap) open, allowing the medium to pass.
Medium reverse flow: valve flap in the self-weight and reverse pressure automatically close, blocking the backflow.
Structure type:
Main forms: rotary opening type, lifting type, butterfly type, spring type and so on.
High-pressure adaptable design: Enhanced valve body materials (such as cast steel, alloy steel) and sealing structure to withstand high-pressure conditions (such as 42.0MPa).
Application Scenarios and Standards
Typical applications:
Petrochemical industry: high-pressure oil and gas transmission pipelines, refining equipment.
Power system: boiler high temperature steam piping, high pressure water supply system.
Implementation standards:
American Standard Specifications: such as API 594 (pinch check valve), API 6D (pipeline valves), ASME B16.34 (valve pressure-temperature rating).
Selection and use of precautions
Installation direction: must be installed strictly in accordance with the direction of media flow, to avoid reverse force resulting in failure.
Maintenance requirements: Regularly check the sealing performance and flap action flexibility to ensure reliability under high pressure conditions.
