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Russian manufacturer of explosion-proof electrical equipment

Explosionproof limit switches made from aluminum VK

Several values of circuit breaker reduction ratio
Availability of four microswitches
Accuracy of positioning and actuation
Certificate Type Product Description Certificate
Permits of the Republic of Kazakhstan VK


Limit switches of VK type are intended for remote control of pipe gate valves in stationary units, as well as for signaling about the position of gate valves (closed or opened) at enterprises in oil, oil-refining, gas and chemical industry. Explosionproof switches VKV are equipped with microswitches of MPV-1V2 type, have explosion protection level “increased reliability from explosion” (2) and 2ExedIBT4 explosion protection marking and are intended for operation in explosion hazardous areas.

General-purpose switches VKO (without explosion protection marking) are equipped with microswitches MPO-1 and are intended for operation in industries where there are no explosion hazardous mixtures under operating conditions


  • The possibility to select the required gear transmission ratio.
  • Availability of four microswitches.


Switches of VKV-2 type contain the following assembly units and parts: body, gear, microswitch block, cover, incoming devices, internal and external grounding devices, position indicator “Opened” (0) and “Closed” (З). Incoming device with nominal diameter of 25 mm consists of coupling, socket, seal ring, plug, fastening screws. Incoming device with nominal diameter of 14 mm consists of socket, threaded nut, washer and seal ring. Microswitch block activates four microswitches of MPV-1V2 type. Composition and design of switch VKV-1 differ from composition and design of switch VKV-2 in that instead of one of the covers, a terminal box consisting of a body, a cover, terminal blocks, two incoming devices with nominal diameter of 25 mm is installed. To control the position of the gate, provision is made for the version of switches with resistor PPB-3A 470 Ohm ±5 % with turning angle of 270°. When ordering switches with a resistor, in version code after transmission ratio code designation, letter “R” shall be indicated, for example, VKO-31R-U1.

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