Butterfly Valve with Limit Switch
A butterfly valve with a monitoring switch combines a disc that opens and closes the fire line with a quarter turn and a switch that senses the valve position in one body. When the valve leaves the fully open position, the switch signals the fire alarm panel, so an accidentally closed zone does not go unnoticed.
Wafer type is available in 2″–12″, grooved ends in 1¼”–12″ and threaded type in 1″–5″, with 73 mm and 76.1 mm pipe options for 2½” lines. It is used for sprinkler zone control, in pump rooms and at alarm valve stations.
Main Applications
- Sprinkler zone control valves
- Wet and dry alarm valve stations
- Fire pump suction and discharge lines
- Hose cabinet and hydrant main supply lines
- Riser and floor isolation points
- Zone isolation during system maintenance
Technical Data
| Connection type | Wafer, grooved ends, threaded |
|---|---|
| Wafer sizes | 2″, 2½”, 3″, 4″, 5″, 6″, 8″, 10″, 12″ (product range) |
| Grooved sizes | 1¼”, 1½”, 2″, 2½” (73 / 76.1 mm), 4″, 6″ (165.1 mm), 8″, 10″, 12″ (product range) |
| Threaded sizes | 1″, 1¼”, 1½”, 2″, 2½” (73 / 76.1 mm), 3″, 5″ (product range) |
| Pressure class | 170 psi – 300 psi; 300 psi on wafer series (manufacturer catalogue) |
| Max. temperature | 120 °C (manufacturer catalogue) |
| Body | Ductile iron, ASTM A536 (manufacturer catalogue) |
| Disc | Nickel-plated ductile iron, ASTM A395 (manufacturer catalogue) |
| Stem | Stainless steel, AISI 416 (manufacturer catalogue) |
| Seal | EPDM (manufacturer catalogue) |
| Operator | Gear operator with handwheel (by model) |
| Monitoring switch | Signals when leaving open position; contact type by model |
Material Options
| Part | Wafer type | Grooved ends | Threaded type |
|---|---|---|---|
| Body | Ductile iron ASTM A536 | Ductile iron ASTM A536 | By model |
| Disc | Ni-plated ductile iron ASTM A395 | Ni-plated ductile iron ASTM A395 | By model |
| Stem | Stainless steel AISI 416 | Stainless steel AISI 416 | Stainless steel (by model) |
| Seal / seat | EPDM | EPDM | EPDM (by model) |
| Connection | Between flanges | With grooved couplings | Female thread |
Which material? Values are taken from the manufacturer’s fire protection catalogue; materials for the threaded type are not listed separately, so they are confirmed by model. For projects requiring UL/FM approval, the model certificate is supplied with the order.
Advantages
Closed Valve Alert
- Position change reported to the panel
- Less risk of a zone left closed
Fast Operation
- Quarter-turn disc movement
- Controlled closing with gear handwheel
Three Connection Options
- Wafer, grooved and threaded bodies
Compact Body
- Shorter than a gate valve
High Pressure Class
- Up to 300 psi catalogue rating
Construction and Design Features
- Ductile iron body and nickel-plated disc
- AISI 416 stainless steel stem
- EPDM-lined seat
- Gear operator and handwheel with position indicator
- Monitoring switch integrated in the gearbox
Send the pipe size, connection type (wafer, grooved, threaded) and the panel’s contact requirement; we will confirm the monitoring butterfly valve with stock details.
How to Choose?
- Choose the connectionUse wafer on flanged lines, grooved ends on grooved lines and threaded models on small sizes.
- Confirm the sizeOn 2½” lines check whether the pipe OD is 73 mm or 76.1 mm.
- Set the pressure classPrefer the 300 psi class that covers the pump shut-off pressure.
- Plan the panel wiringMatch the switch contact type with the fire alarm panel.
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