I-INTRODUCTION TO ONE-WAY VALVE
- A type of valve that only allows liquid flow in one direction and the other to be controlled. Preventing water backflow avoids pressure drop protecting the hydraulic system of the system 
- Classification: check valve is diverse in types, each with different characteristics and applications such as check valve type one flap (Swing), check valve type two flaps (Wafer), check valve type axial (Axial), ball check valve, counterweight (Tilting) ... ..
II- INSTALLATION INSTRUCTIONS
- The dimensions of the pipe and valve must be identical
- Depending on the different applications in the system, choose the appropriate valve type
- The correct direction of the arrow on the valve body must coincide with the direction of the fluid flow
- There should be a seal between the two flanges of the pipe and the valve. The sealing gasket must be the same diameter as that of the valve, to avoid the case that the seal is incorrectly sized, causing the valve to jam or leak of the system.
- Tighten bolts, nuts slowly balance to ensure flatness with pipe flange
- Note about the distance, a minimum distance from the check valve to the next device must be ensured to avoid hydraulic collisions when the valve opens and closes. should be appreciated between the check valve and other factors to avoid hydraulic conflicts.
