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Accessories & Parts

31-2 Limit Switch Assembly

The Model 31-2 Dual Limit Switch Assembly is a device that uses movement of the valve stem to make or break electrical contacts at two designated points in the valve travel (typically full open and full closed). It consists of an adaptor threaded into the center port of the valve bonnet, a rod threaded into the main valve stem, a heavy-duty stem seal, two actuating collars, and two switch units. It may be installed on virtually any OCV control valve, and can be done so without any disassembly of the valve itself.
  • Provides electrical indication of two different valve positions.
  • Adjustable to any point of valve travel.
  • Heavy-duty stem seal.
  • Installed without disassembly of valve.
  • Available in weatherproof or explosion-proof enclosures.
  • SPDT contacts (standard) DPDT (optional)

MODEL 31-2 ASSY MATRIX

Limit-Switch-31-2

Consult Factory for part numbers on DPDT, other seal material, and all model 31-2 switches shown in the Actuation matrix.
NOTE: Factory recommended valve installation should allow for indicator rod to be in the vertical position.

ELECTRICAL RATING

SPDT:
15 amps @ 125-480 VAC
1/2 amp @ 125 VDC, 1/4 amp @ 250 VDC

DPDT:
10 amps @ 125-250 VAC
0.3 amp @ 125 VDC, 0.15 amp @ 250 VDC

ENCLOSURES
OP Switches Weatherproof NEMA 4
EX Switches Explosion Proof NEMA 7, 9

MATERIALS

Indicator Rod:Stainless Steel
Adapter:Stainless Steel
Collars:Stainless Steel

SCHEMATIC SYMBOL

The Model 31-2 is shown on OCV Valve Schematics as:  31-2symbol

31-2schematic
EXAMPLE: Shown here on a Model 115-4 Solenoid Control Valve.