Technical selection
Specifications and configuration
Reference — Watts — W5000 family
| Parameter | Documented value / configuration |
|---|---|
| Function | Backflow prevention |
| Interface | DIN/ISO welded; clamp |
| Bore | DN15 to DN100 |
| Test conditions | media: water with up to 50% ethylene glycol; nominal pressure: PN10; temperature: -10°C to 100°C; test standard: GB/T 13927 |
Reference — Parker Hannifin — LIQUIfit 7992
| Parameter | Documented value / configuration |
|---|---|
| Seal | EPDM |
| Actuation | Passive non-return valve |
| Cracking pressure | 1 2 in OD bar: 0.03; up to 3 8 in OD bar: 0.02 |
| Flow direction | One direction; prevents return flow |
Reference — FITOK — CV series; 0.21 bar nominal example where stated
| Parameter | Documented value / configuration |
|---|---|
| Nominal cracking options | 0.02, 0.06, 0.21, 0.68, 1.7 barConditions: Attributed manufacturer series/configuration example only; not site stock or capability; scope: CV only. Actual cracking and reseal figures refer specifically to the 0.21 bar nominal row; resealing is a back-pressure criterion, not forward working pressure. Do not substitute CH/CO rows. |
| Cracking adjustment | Fixed factory selection, not field-adjustableConditions: Attributed manufacturer series/configuration example only; not site stock or capability; scope: CV only. Actual cracking and reseal figures refer specifically to the 0.21 bar nominal row; resealing is a back-pressure criterion, not forward working pressure. Do not substitute CH/CO rows. |
| Example nominal cracking | 0.21 barConditions: Attributed manufacturer series/configuration example only; not site stock or capability; scope: CV only. Actual cracking and reseal figures refer specifically to the 0.21 bar nominal row; resealing is a back-pressure criterion, not forward working pressure. Do not substitute CH/CO rows. |
| Example actual cracking band | 0.06 to 0.34 barConditions: Attributed manufacturer series/configuration example only; not site stock or capability; scope: CV only. Actual cracking and reseal figures refer specifically to the 0.21 bar nominal row; resealing is a back-pressure criterion, not forward working pressure. Do not substitute CH/CO rows. |
| Example reseal back pressure | At or below 0.42 barConditions: Attributed manufacturer series/configuration example only; not site stock or capability; scope: CV only. Actual cracking and reseal figures refer specifically to the 0.21 bar nominal row; resealing is a back-pressure criterion, not forward working pressure. Do not substitute CH/CO rows. |
Candidate Product-family draft. Configuration, availability and acceptance are established for the requested item.
Component scope
Check valves address reverse-flow control at a specific location in the loop. Opening behavior, installation direction and reverse leakage depend on the chosen design and test conditions.
Configuration and selection
Provide normal and reverse-flow conditions, connection size, orientation, coolant and materials. Identify any cracking-pressure requirement and the acceptance method rather than assuming one family-wide value.
Define before quotation
- Flow direction and connection interface
- Coolant, temperature, and pressure range
- Opening/cracking and reverse-flow requirements
- Leakage, dynamic, cleanliness, and validation method
Evidence and supply boundary
Exact model, interfaces, materials, coolant compatibility, operating conditions, tests, documentation, quantity and supply scope require configuration-specific review. No stock, certification or performance is implied by this draft.
