SMC (6940090) 694 Series PVC NSF Check Valve ; 1/4"FNPT x 1/4"FNPT Buna
SMC 694 Series Check Valve Technical Details
| Model Number | SMC 6940090 |
| Series | 694 Series |
| Connection Type | 1/4" FNPT x 1/4" FNPT |
| Body Material | PVC (Polyvinyl Chloride) |
| Seal Material | Buna-N (Nitrile Rubber) |
| Certification | NSF Certified |
| Flow Direction | One-way, inline check valve |
| Application | Water filtration, RO systems, pump protection |
Installing the SMC 6940090 Check Valve
- Apply thread sealant tape (PTFE) to male NPT fittings that will thread into both 1/4" FNPT ports on the valve body.
- Install the check valve in the correct flow direction as indicated by the arrow molded into the PVC body, typically after pumps or before storage tanks.
- Hand-tighten fittings, then use a wrench to snug an additional quarter turn. Do not over-torque PVC threads.
- Pressurize the system slowly and check all threaded connections for leaks before leaving the installation unattended.
System Integration
The SMC 6940090 check valve integrates with any 1/4" FNPT threaded system including reverse osmosis units, booster pumps, water filtration housings, and storage tank lines. The Buna-N seal is compatible with chlorinated water, sediment-filtered feed water, and product water up to 100°F. NSF certification ensures materials meet drinking water safety standards. This valve is a direct replacement for other SMC 694 Series check valves and comparable 1/4" FNPT check valves from other manufacturers.
SMC 694 Series Check Valve Technical Details
| Model Number | SMC 6940090 |
| Series | 694 Series |
| Connection Type | 1/4" FNPT x 1/4" FNPT |
| Body Material | PVC (Polyvinyl Chloride) |
| Seal Material | Buna-N (Nitrile Rubber) |
| Certification | NSF Certified |
| Flow Direction | One-way, inline check valve |
| Application | Water filtration, RO systems, pump protection |
Installing the SMC 6940090 Check Valve
- Apply thread sealant tape (PTFE) to male NPT fittings that will thread into both 1/4" FNPT ports on the valve body.
- Install the check valve in the correct flow direction as indicated by the arrow molded into the PVC body, typically after pumps or before storage tanks.
- Hand-tighten fittings, then use a wrench to snug an additional quarter turn. Do not over-torque PVC threads.
- Pressurize the system slowly and check all threaded connections for leaks before leaving the installation unattended.
System Integration
The SMC 6940090 check valve integrates with any 1/4" FNPT threaded system including reverse osmosis units, booster pumps, water filtration housings, and storage tank lines. The Buna-N seal is compatible with chlorinated water, sediment-filtered feed water, and product water up to 100°F. NSF certification ensures materials meet drinking water safety standards. This valve is a direct replacement for other SMC 694 Series check valves and comparable 1/4" FNPT check valves from other manufacturers.
Description
SMC 694 Series Check Valve Technical Details
| Model Number | SMC 6940090 |
| Series | 694 Series |
| Connection Type | 1/4" FNPT x 1/4" FNPT |
| Body Material | PVC (Polyvinyl Chloride) |
| Seal Material | Buna-N (Nitrile Rubber) |
| Certification | NSF Certified |
| Flow Direction | One-way, inline check valve |
| Application | Water filtration, RO systems, pump protection |
Installing the SMC 6940090 Check Valve
- Apply thread sealant tape (PTFE) to male NPT fittings that will thread into both 1/4" FNPT ports on the valve body.
- Install the check valve in the correct flow direction as indicated by the arrow molded into the PVC body, typically after pumps or before storage tanks.
- Hand-tighten fittings, then use a wrench to snug an additional quarter turn. Do not over-torque PVC threads.
- Pressurize the system slowly and check all threaded connections for leaks before leaving the installation unattended.
System Integration
The SMC 6940090 check valve integrates with any 1/4" FNPT threaded system including reverse osmosis units, booster pumps, water filtration housings, and storage tank lines. The Buna-N seal is compatible with chlorinated water, sediment-filtered feed water, and product water up to 100°F. NSF certification ensures materials meet drinking water safety standards. This valve is a direct replacement for other SMC 694 Series check valves and comparable 1/4" FNPT check valves from other manufacturers.
