Check valves instruction manual

Instruction Manual

Name: Check Valve

Specifications: DN50 ~ 300mm

Pressure: PN10 ~ 25

Swing check valve is automatically prevent fluid backflow valve. It automatically open the valve under fluid pressure, fluid flows from the inlet side of the outlet side; when the pressure is lower than the inlet side of the outlet side pressure, the valve is automatically closed by fluid pressure and other factors and self-respect, to prevent backflow of fluid .


Main features

1. simple structure, reliable operation, fluid resistance is smaller than the lift check valve, suitable for high-caliber occasions.

2. by the pressure of the fluid automatically.

3. only for a one-way medium.

Second, the technical specifications

1. Nominal pressure: PN10 ~ 25

2. nominal diameter: DN50-300mm


Third, using the standard

1. Design Standard: AWWA C508

2. inspection and test standard: FM1210 UL312

3. the length of the structure: EN508 S03

4. flange dimensions: ANSI B16.1 Class125


Fourth, the main parts and materials for medium and temperature

Part Name Material Name
Body, bonnet QT500-7
Rocker 304 / QT500-7
Valve plate QT500-7
EPDM seals
Screw plug 304
Temperature 0 ~ 80 ℃
For media Water
Fifth, storage, installation, use and maintenance

1. the valve should be stored in a dry room.

2. long-term storage to regularly check valves at both ends of the cover is intact, remove dust and dirt in the valve processing and top coat anti-rust oil to prevent corrosion.

3. before installation should first check valve flag, to determine if the valve meets the requirements, then remove the cover at both ends of the valves clean.

4. when closed, as long as the media can be cut off.


Six, may malfunction and troubleshooting

Fault reason to exclude methods
Body and bonnet leak at the connection
1. or bolt not tightened elastic uneven.

2. the flange surface damage or debris.

3. gasket failure.

4. the pressure relief system, re-tighten the bolts evenly.

5. finishing the sealing surface and remove dust.

6. replace the gasket.


Leaking valve seals at
1. sealing surface inclusions.

2. the sealing surface is damaged.

3. clean

4. repair the damaged sealing surface.

valve opening and closing is not flexible, abrasion or bending uranium pin 1, replace the pin uranium.
Seven, safe operation:

After the pressure relief system before loosening bolts and adjust the valve cover and valve body, and a connecting bolt side flange and piping.