Valve type
Wafer type check valve: double disc check valve, piston lift check valve
Usage and Feature
1. Usages
Series check valves are used in oilfield, chemical-industrial, power-station for checking the flow-backward of the material in the pipe.
2. Features
|
Type |
Nominal pressure |
Strength testing pressure |
High-pressure Sealing testing Pressure |
Low-pressure Sealing testing Pressure |
Temperature Range |
Applicable medium |
|
|
H2a3AR |
1.6MPa |
2.4Mpa |
1.76MPa |
Non |
CC10 |
≤425°C |
Water, oil |
|
H3a3AR |
2.5MPa |
3.75MPa |
2.75MPa |
CA23 |
≤540°C |
steam |
|
|
H4a3AR |
4.0MPa |
6.0MPa |
4.4MPa |
||||
|
H5a3AR |
6.4MPa |
9.6MPa |
7.04MPa |
CS34 |
≤316°C |
||
|
150Lb |
3.03 MPa |
2.2MPa |
|||||
|
300Lb |
7.78MPa |
5.78Mpa |
≤425°C |
||||
Working theory and configuration direction
1. Series check valve are designed and made under standard API594 and JB/T7746, tested under standard API598,JB/T9092.
2. The disc opens under the pressure of the liquid, the liquid flow from the inlet to the outlet.
3. The sealing fixing adopts the welding Cr13 stainless steel which is good abrade-resistance,
Corrode-resistance, anti-bruise for extending use.
4. Our products have reasonable configuration, beautiful design, excellent feature, reliable sealing function.
5. the opening pressure is very small, the disc can be fully opened by small press.
6. the disc close quickly as the water press is small.
7. It is very easy to used in level and vertical position.
8. the all parts is pick according to the working situation.
The request of installation
1. To install any valves must be sure the safety and easy to operate ,repair, unpack and installment.
2. The check valve must be vertical installed in the aclinic pipes.
3. Keep the same directions of medium flowing and valve body marked direction. without mark, please install by valve principle. Do not install on the wrong way.
4. Before the installation. checking the style requested. The inside and outside of the valves are clear or not. the valve is in the good condition or not.
5. When install the flanged ends valve. must keep the consistent and reasonable clearance of the valve’s flange and the pipe’s flange. Do not appear the wrong link, crossing link or opened. Put the washer in the middle of flange. The screw keep tie and balance. After fix the screw. testing the clearance of the parts. Which keep the same or not.
6. According to the fact, adopting the measure to resist the corrode and keep the temperature.
Valve configuration simple picture and main parts, material list
A) wafer ends piston-lift check valve
No Parts name Material
1 Body ASTM A105
2 Disc ASTM A105 +F6
3 Spring 1Cr18Ni9Ti
4 Retainer WCB
5 Ring 1Cr18Ni9Ti
A) wafer ends dual plate check valve
No Parts name Material
1 Body CS.SS,DSS
2 Disc CS.SS,DSS
3 Spring 1Cr18Ni9Ti,Inconel750, 60Si2Mn
4 Retainer CS.SS,DSS
5 Bolt SS304
Main outline dimension and ends size
(Attached products catalog)
Maintenance and Protection.
1. Put the valve in the draught place with filling of two side. For the long time store, smearing the rust-proof oil in the regulated time.
2. Must be fixed when the valve stored, that is for protecting the sealing face.
3. Clear the valve before installation.
4. Please check the pressure, diameter before installation that will avoid wrong install.
5. The valve can be installed in any place except it is appointed. Which is easy to work and fix.
Fault, Reason and Fix
| Fault | Reason | Fix measure |
| Leakage of the sealing room | 1. Attached dirt or the sealing loop damaged | 1. Clear the dirt or replace sealing parts |
| Leakage of the gasket |
|
2. Tie the screw that enable the bonnet tie and packing box raised |