PVC non return valve is a type of pipe valve fitting, used to control the flow direction of fluid. Its main material is polyvinyl chloride (PVC), which has the characteristics of corrosion resistance and high pressure resistance. The function of the check valve is to ensure that the fluid can only flow in one direction, prevent backflow and reverse flow, thereby protecting equipment and systems from damage.
Structure
PVC non return valve consists of valve body, valve cover, valve disc and sealing ring. The valve body is the main part of the check valve, usually made of high-quality polyvinyl chloride material; the valve cover is used to fix the valve disc and is connected to the valve body by threads or flanges; the valve disc is a key component, usually made of rubber or polyethylene material, to ensure good sealing performance and wear resistance; the sealing ring ensures the tight connection between the valve disc and the valve seat to prevent leakage.
Function and characteristics
The main function of PVC non return valve is to prevent the medium from flowing back. Check valve has only one flow direction, that is, the medium can only flow in from the inlet end and flow out from the outlet end. When the inlet pressure is greater than the sum of the weight of the valve disc and its flow resistance, the valve is opened; conversely, the check valve is closed when the medium flows back.
The specific application scenarios of PVC non return valve include:
1. Chemical industry: used to protect equipment from damage caused by backflow or reverse flow.
2. Construction field: widely used in water supply pipes and drainage systems to ensure the safety of water supply and smooth drainage.
3. Civil field: commonly used in household water supply pipes and bathroom drainage systems to protect household water safety.
The characteristics of PVC non return valve include:
1. Material: all plastic material, no rust, anti-corrosion.
2. Sealing performance: EPDM sealing ring is used, with good sealing performance and strong anti-corrosion.
3. Design: two-way double union design, easy maintenance, can be repaired without stopping work.
4. Installation: Vertical installation, flow direction from bottom to top, the arrow direction must be identified during installation
How to choose a suitable PVC non return valve?
Choosing a suitable PVC non return valve requires considering the following core factors: media type, working pressure, working temperature and installation location.
1. The type of medium is the key factor. PVC material has good corrosion resistance and chemical stability, and is suitable for media such as air, oil, and corrosive chemical liquids. However, PVC material is not suitable for media containing solid particles and high viscosity.
2. Working pressure is also an important factor to consider when choosing a PVC non return valve. PVC check valves are suitable for low-pressure and normal temperature pipeline systems, and their working pressure is generally less than 1.6MPa.
3. Working temperature range is also very important for the selection of PVC check valves. The temperature resistance range of PVC material is generally between -12℃ and 120℃, which is suitable for normal temperature environments.
4. Installation location will also affect the selection of check valves. PVC check valves are suitable for horizontal and vertical pipelines, and are easy to install and durable.
