Lift Type Check Valve

Lift check valve (alias: check valve, check valve, backflow valve) is a kind of automatic opening and closing valve relying on the flow of the medium itself, used to prevent backflow of the medium in the pipeline. Through the valve flap in the media flow when open, against the flow of the mechanism of closure, to protect the one-way flow of fluids.

Structural Components

Core components:

Valve body: similar in shape to the globe valve, made of cast steel, stainless steel, etc., with the inner cavity designed for straight or vertical flow path.
Valve flap: vertical lifting movement along the centre line of the valve body, the material can be all-metal (such as cast steel) or metal + gasket composite structure, some models through the spring to enhance the closing force.
Valve seat: closely matched with the valve flap, the sealing surface adopts metal hard seal or soft seal (such as PTFE), to ensure zero leakage during closure.
Auxiliary design:

Guiding device: Controls the flap lift trajectory to prevent seal failure due to deflection.
Spring mechanism (some models): Auxiliary valve flap fast closing, to improve the response speed in low-pressure working conditions.

Specification

Nominal diameter: DN15～DN300 (conventional range), suitable for small and medium diameter pipes.
Pressure level:
National standard: 1.6MPa～10.0MPa.
International standard: meet the requirements of API, DIN, etc., the highest pressure resistance up to Class2500.
Temperature range: -29℃ (low temperature) to +550℃ (high temperature steam).
Connection: flange, welding (e.g. chemical pipeline) or threaded (small diameter).

 

GNEE Lift Type Check Valve

 

Advantages

High sealing performance:
The valve flap and valve seat are tightly fitted, with a leakage class of Class VI, especially suitable for high pressure and high purity media.
Simple and reliable structure:
No complex transmission mechanism, low failure rate, maintenance costs of only 30% of the swing check valve.
Low differential pressure adaptability:
Spring-assisted models can close quickly at low flow rates or under low differential pressure conditions, preventing water hammer.
Low flow resistance design:
The flow resistance coefficient of straight-through valve body is only 50% of that of swing-open type, which reduces energy loss.

Applications

• Petroleum and chemical industry:

Crude oil pipeline, acid and alkali media pipeline, to prevent backflow of corrosive liquids.

• Electric power and metallurgy:

High-temperature steam system, cooling water circulation pipeline, to protect the safety of equipment.

• Municipal and Environmental Protection:

Water supply and drainage systems, sewage treatment plants, intercepting the medium containing solid particles backflow.

• Food and Pharmaceutical:

Aseptic fluid piping, to avoid cross-contamination

• Suitable for severe working conditions:

High-temperature and corrosion-resistant characteristics to meet the needs of the chemical industry, electric power and other extreme environments.

• Economy and long life:

Simple structure reduces procurement costs, metal sealing surface life of more than 10 years.

• Convenient maintenance:

Modular design supports on-line valve or seal replacement, reducing downtime.

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