Constant water level valve, vacuum breaker, check valve, check valve No. LF709 type double check valve (for water / hot water)
It is primarily used to deal with backflow caused by back pressure at cross-connection locations* where the risk is low, such as in dairy, food and beverage applications.
*Please note that each business entity may have its own standards regarding installation.
Major features
- Equipped with 2 check valves and 4 test cocks for function check, easy maintenance.
- Inspection and maintenance is possible with general tools while attached to the pipe.
- The flow path is large and the pressure loss is small.
- Compact and can be installed in a small space.
specification
| Product code | NO.LF709NRS |
|---|---|
| Valve type | Double check valve |
| Nominal diameter | 65-250 (2 1/2-10)Nominal diameter 125 is not manufactured. |
| Applicable fluid | Water / hot water |
| Fluid temperature | 0.5-43 ℃ |
| Applicable pressure | 1.2MPa or less |
| Minimum differential pressure for valve opening | 0.03MPa |
| End connection | ASME Class 150 FF FlangeWe also sell phase flanges (with bolts, nuts, flat washers, and packing). |
| Mounting posture | Upright mounting on horizontal piping |
| Optional Accessories | Separate strainerStrainer that can be attached separately Nominal diameter 20 to 50: Main body (CAC406), net (SUS), end connection JIS Rc screw, with short nipple (SUS), applicable pressure 1.0MPa or less Nominal diameter 65-250: Body (FC / epoxy resin coating), net (SUS), End connection ASME class 150 FF flange can be attached. |
| Material body | FC / epoxy resin coating |
| Material parts | Bronze / SUS / synthetic rubber |
- For the No. LF709 type entrance / exit and sluice valve, we also manufacture an external thread type valve stem structure whose open / closed state can be visually recognized from the outside.
- We also sell a test kit for inspection (TK-9A type).
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Frequently Asked Questions and Explanations
What is the purpose of the check valve?
The check valve is used to prevent backflow due to back pressure, which is higher on the outlet side than on the inlet side.
What is a double check (valve)?
A normal check valve has one valve to prevent backflow, but it is equipped with two valves to improve safety.
What is the operability of the valve body?
Refers to the release pressure of the valve body. It is listed as a performance item of the Japan Water Works Association standard "JWWA B129 check valve for water supply".
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