NRS Valve Supervisory Switch
An NRS valve tamper switch is an electric switch that senses the position of a non-rising stem valve whose stem does not protrude. Because the stem cannot be seen from outside, the switch works by connecting to the indicator mechanism on the valve body or to a post indicator.
It is used on underground hydrant network valves, sectional valves operated by post indicators and NRS valves in tight spaces to prevent a valve being left closed.
Main Applications
- Underground hydrant network valves
- Sectional valves with post indicators
- NRS fire valves in tight spaces
- NRS isolation valves in pump rooms
Technical Data
| Function | Monitoring NRS valve position |
|---|---|
| Mounting | On the valve body or post indicator (by model) |
| Sensing | Indicator mechanism or indicator stem |
| Output | Dry contact (type by model) |
| Alarm moment | When the valve leaves the open position |
| Protection class | By model; outdoor suitability confirmed |
| Cable entry | By model |
Material Options
| Part | Tamper switch |
|---|---|
| Housing | By model |
| Sensing element | By model |
| Contact | By model |
| Mounting | On valve or indicator |
Which material? As this product is not listed in the store, whether the switch fits the valve or the post indicator is decided with you by valve model; the protection class is checked separately for outdoor use.
Advantages
Monitoring a Hidden Stem
- Position tracking on NRS valves
Indicator Compatible
- Can be fitted to a post indicator
Closed Valve Alert
- Panel informed immediately
Site Security
- Interference with buried valves is noticed
Construction and Design Features
- Mounting kit for valve or indicator
- Position sensing element
- Contact block
- Cable entry suited to outdoor use (by model)
Send the NRS valve model, whether a post indicator is used and the panel input type; we will choose the right switch together.
How to Choose?
- Define the mounting pointClarify whether the switch goes on the valve or the indicator.
- Choose the contactSelect the contact to match the panel input type.
- Check site conditionsConfirm the protection class outdoors.
- Run a function testMove the valve and verify the panel signal.
Complementary Products
Why ORFA?
Other Water Fire Suppression Systems
Flow Switch
Flow switches send a signal to the alarm panel when water starts flowing in the sprinkler line, indicating a fire.
Details →
Flow Meters
Flow meters measure the flow delivered by the fire pump on pump test lines.
Details →
Pressure Relief Valve
Pressure relief valves protect the installation by discharging excess water when overpressure occurs in fire pump systems.
Details →Deluge Alarm System and Equipment
Deluge alarm systems supply water simultaneously to open sprinkler or nozzle lines upon a detection signal.
Details →Wet Alarm Valve System and Equipment
Wet alarm valve systems are the main control valve and equipment that raise an alarm when a sprinkler opens in water-filled sprinkler lines.
Details →
Fire Department Suction Connection
Fire department suction connections are connection points that allow fire trucks to draw water from a reservoir or installation.
Details →
Fire Department Inlet Connection
Fire department inlet connections allow fire trucks to pump water into the building fire installation from outside.
Details →
Butterfly Valve with Limit Switch
Butterfly valves with limit switch report the valve position to the alarm panel in fire protection lines.
Details →Dry Alarm Valve System and Equipment
Dry alarm valve systems are valves and equipment controlling sprinkler lines filled with pressurized air in areas at risk of freezing.
Details →
NRS Non-Rising Stem Valve
NRS non-rising stem valves are fire line gate valves whose stem does not rise, suitable for limited spaces.
Details →
OS&Y Rising Stem Valve
OS&Y rising stem valves are fire line gate valves whose open or closed position can be seen from the stem.
Details →OS&Y Valve Supervisory Switch
OS&Y valve supervisory switches detect the position of rising stem valves and report it to the fire alarm panel.
Details →
Preaction Systems
Preaction systems release water into the piping only after a detection signal, used where accidental discharge must be avoided.
Details →
Post Indicator
Post indicators allow underground fire line valves to be operated from above ground and show their position.
Details →
Test and Drain Valve
Test and drain valves allow flow testing and draining of sprinkler lines.
Details →
Waste Cone
Waste cones direct water from test and drain lines to the drain in a visible way.
Details →
Fire Check Valve
Fire check valves are approved check valves that prevent backflow in fire protection installations.
Details →
Fire Hose Cabinets
Fire hose cabinets house the hose, nozzle and valve together and are used for first response in buildings.
Details →
Fire Systems Pressure Reducing Valve
Fire systems pressure reducing valves lower excess pressure on lower floors of high-rise buildings to a suitable value for fire equipment.
Details →
Fire Sprinklers
Fire sprinklers open when the ambient temperature rises and automatically spray water onto the fire area.
Details →
Fire Valves
Fire valves are approved valves used to open and shut off lines in fire protection installations.
Details →
Above Ground Fire Hydrants
Above ground fire hydrants are outdoor hydrants that allow fire crews to draw water from the mains.
Details →
Grooved Pipe Fittings
Grooved pipe fittings allow fast assembly with couplings, without welding or threading, in fire and general installations.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.