Back Pressure valve
What is YB7 Back Pressure valve?
Back pressure valve is used to the applicable conditions that the common controlling system can not be used, as a kind of special pressure control valves, it commonly match with automatic recirculation valve to protect pump system.
It is used to control upstream pressure, enables to achieve factory technological setting pressure value and system required pressure value, preventing vaporization and corrosion phenomena.
Carefully matched technological condition between automatic recirculation valve and YB7 valve, ensure pump get the best protection, guarantee long-term stability for safe operation system.
technical parameter
WORKING PRINCIPLE
This valve is self-support type, do axial movement along valve disc by spring force function, so as to generate differential pressure around YB7 Valve. Meanwhile, valve seat hole opening bigger and bigger gradually until pressure differential reaches setting point.
MAINTENANCE
Be easy to operation and maintenance.We can provide installation and maintenance manual.
VALVE SIZE
DN25~DN150（1″-6″）Standard size: DN25~DN150（1″-6″）
PRESSURE RANGE
Nominal pressure range: PN10~PN400（ANSI 150Lbs~ANSI 2500Lbs）.Other pressure range is according to requirements.
CONNECTION
Flange connection standard is according to DIN or ANSI, other standard (e.g. ISO, BS, JIS, NF) can be customerized.
Material temperature range
| Body material Sealing material |
A105 | LF2 | F304 | F316 |
| NBR | -20～+100 | -30～+100 | -30～+100 | -30～+100 |
| FKM | -20～+200 | -40～+200 | -40～+200 | -40～+200 |
| PTFE | -20～+230 | -40～+230 | -80～+230 | -80～+230 |
| Stainless steel gasket | -20～+300 | -40～+300 | -196～+300 | -196～+300 |
Installation
In order to make the valve to achieve to best performance, BPV should be installed in downstream of the important protected valve, since valve outlet velocity is high, installation location should be close deaerator or water supply tank.
Parts and material
| NO | Name | Material（ Commonly used） | |||
| 1 | Body | A105 | LF2 | F304 | F316 |
| 2 | Elastic block circle | 2Cr13 | 2Cr13 | 304 | 316 |
| 3 | Seat | 2Cr13+STL | 2Cr13+STL | 304+STL | 316+STL |
| 4 | O ring | EPDM | EPDM | EPDM | EPDM |
| 5 | Trim | 2Cr13+STL | 2Cr13+STL | 304+STL | 316+STL |
| 6 | Spring | 60Si2Mn | 60Si2Mn | 1Cr18Ni9Ti | 316 |
| 7 | Pressed nut | 2Cr13 | 2Cr13 | 304 | 316 |
