Product Description

The three-in-one check valve is a valve device that integrates multiple functions. It is mainly used in pipeline systems to prevent medium backflow, balance pressure or protect equipment safety. The following is a detailed introduction about it:
1. Basic functions
The three-in-one check valve usually combines the following three functions:
- Check function: prevent the medium (liquid, gas, etc.) from flowing backwards to avoid damage to equipment such as pumps and compressors caused by backflow.
- Pressure reduction/pressure relief function: when the system pressure exceeds the set value, it automatically releases part of the pressure to protect pipelines and equipment.
- Isolation function: cut off the flow of medium during inspection or maintenance, similar to the function of a stop valve.

2. Structural features
- Valve body design: usually adopts a compact structure, integrating multiple functional components (such as valve disc, spring, pressure relief device, etc.).
- Material selection: cast iron, stainless steel, brass and other materials are selected according to the characteristics of the medium (corrosiveness, temperature, pressure).
- Drive mode: mostly automatic operation (depending on medium pressure or spring force), some models can be manually controlled.

3. Application scenarios
- Water supply and drainage system: prevent water hammer effect or backflow when the water pump stops.
- Heating, ventilation and air conditioning (HVAC)**: balance the pressure of hot and cold water systems.
- Industrial pipelines: protect equipment in chemical, oil and natural gas pipelines.
- Fire protection system: ensure one-way water supply in the fire water network.

4. Advantages
- Space saving: three functions in one, reducing the number of valves in the pipeline.
- Cost-effectiveness: installation and maintenance costs are lower than multiple independent valves.
- High reliability: integrated design reduces the risk of leakage.

Core Technical Parameters:

Nominal diameter: DN40 to DN600.

Nominal pressure: PN10, PN16 (common for water systems).

Connection method: Flange connection (RF surface flange, national standard GB / American standard ANSI).

Applicable media: Cold water, hot water, ethylene glycol antifreeze, fire-fighting water, boiler condensate.

Media temperature: 0℃ to 120℃ (standard), high-temperature heating type 150℃.

Structural features: Can be installed horizontally or vertically in both directions, equipped with opening memory and pressure measurement adjustment ports.

All valves are equipped with professional export protective packaging. 

With protective caps on the sealing surfaces, rust-proof treatment, and shock-absorbing material filling to ensure intact transport; the loading is secure and safe. 

We can also customize packaging according to customer requirements.

Regarding transportation methods, we can provide appropriate transportation options based on the cargo requirements and the customer's timeliness requirements. 

Common transportation methods include: sea freight, air freight, land freight, and express delivery.