Features:
- Fail-Safe wear pattern. No dangerous “shoulder” to prevent shutdown so that switch is always functional with clean oil above its pour point.
- Shutdown time adjustable over a wide range
- Explosion-proof models available
- Overpressure rupture assembly optional
- Low flow-rate option available
- Switch contact rating – 2A at 30 VAC / DC
The switch is available with an overpressure rupture assembly which will instantaneously bleed off and stop the engine in the event that the lube-line check-valve plugs. The standard rupture disc fails at 1750 psi. Other rupture-pressure options available upon request.
The non-explosion proof switch has been tested to 5,000 psi. Its maximum recommended working pressure is 2,000 psi. The explosion-proof switch has been tested to 15,000 psi and its recommended working pressure is 8,600 psi.
The standard no-flow switch is supplied with a standard spring for lubricator pump rates of 6 drops per minute or more. Optionally, a light-spring model is available for lubricator pump rates less than 6 drops per minute and greater than 3 drops per minute.
Specifications:
MATERIALS OF CONSTRUCTION:
MATERIALS OF CONSTRUCTION:
Body – Aluminum
Seal Material – Buna-N
Spring – Stainless Steel
STANDARD MODEL OPTIONS:(* For Lubricator Pump Rates of 6 Drops Per Minute or More)
NFS-3 = No-Flow Switch without Mounting Bracket
NFS-4 = No Flow Switch with Mounting Bracket for Ajax
NFS-5 = Triple No-Flow Switch with Mounting Bracket for Large Ajax (3 switches on one bracket)
NFS-6 = Explosion-Proof No-Flow Switch
NFS-7 = No-Flow Switch with Overpressure Rupture Assembly
NFS-9 = No-Flow Switch with Overpressure Rupture Assembly and Mounting Bracket for Ajax
NFS-25 = Explosion-Proof No-Flow Switch with Overpressure Rupture Assembly
LIGHT-SPRING MODEL OPTIONS:(* For Lubricator Pump Rates Less than 6 Drops Per Minute and Greater than 3 Drops Per Minute)
NFS-3L = No-Flow Switch without Mounting Bracket
NFS-4L = No Flow Switch with Mounting Bracket for Ajax
NFS-5L = Triple No-Flow Switch with Mounting Bracket for Large Ajax (3 switches on one bracket)
NFS-6L = Explosion-Proof No-Flow Switch
NFS-7L = No-Flow Switch with Overpressure Rupture Assembly
NFS-9L = No-Flow Switch with Overpressure Rupture Assembly and Mounting Bracket for Ajax
NFS-25L = Explosion-Proof No-Flow Switch with Overpressure Rupture Assembly