Description
Elektrogas PCSHP Proof of Closure Switch for VMH Gas Valves
The Elektrogas PCSHP is a mechanical proof of closure position confirmation switch designed specifically for the complete range of Elektrogas VMH electro-hydraulic gas safety shut-off valves.
Mounted directly to the VMH actuator, the PCSHP monitors the mechanical position of the valve plate and provides an electrical confirmation when the gas valve has reached its closed position. This allows burner management systems, gas proving controls, PLCs and other safety circuits to verify that the VMH valve has physically closed rather than relying solely on the electrical status of the actuator.
The PCS system is designed in accordance with EN161 requirements for closed-position detection. Elektrogas specifies that the switch must change state when the valve plate is within 1mm of its closed position, making the PCSHP a true closed-position monitoring device rather than an indication of the fully open position.
Proof of Closure Function
The PCSHP is mechanically operated by the movement of the VMH valve plate.
As the normally closed VMH valve reaches its closed position, the switch rod is mechanically actuated and the electrical contact changes state. This provides positive confirmation to the control system that the valve plate has physically returned to its safety shut-off position.
This is particularly useful in safety-critical gas installations where confirmation of valve closure is required before the burner sequence can continue or restart.
EN161 Closed Position Detection
The PCS is specifically intended to detect the closed status of the gas valve.
In accordance with EN161, the electrical switch changes state when the valve plate is within 1mm of its closed position. It should therefore be regarded as a closed-position confirmation or proof-of-closure switch, rather than a fully-open position indicator.
VMH Valve Compatibility
The PCSHP rod configuration is specified for all Elektrogas VMH models, making one PCSHP type suitable across the VMH electro-hydraulic valve range.
Suitable for:
✓ VMH7 – DN65 / 2½"
✓ VMH8 – DN80 / 3"
✓ VMH9 – DN100 / 4"
✓ VMH93 – DN125 / 5"
✓ VMH95 – DN150 / 6"
✓ VMH98 – DN200 / 8"
✓ VMH910 – DN250 / 10"
✓ VMH912 – DN300 / 12"
Technical Specification
Function: Closed Position Confirmation
Operation: Mechanically Activated
Model: PCSHP
Valve Compatibility: Elektrogas VMH
Connection: G1/8 ISO 228-1
Standard Maximum Pressure: 500 mBar
Optional Maximum Pressure: 6 Bar
Standard Test Pressure: 0.75 Bar
6 Bar Version Test Pressure: 9 Bar
Ambient Temperature: -15°C to +60°C
Media: Air and Non-Aggressive Gases
Gas Families: 1, 2 & 3 according to EN437
Electrical Connection: ISO 4400
Cable Gland: PG11
Protection: IP54 Standard
Optional Protection: IP65
Standard Weight: 0.20kg
The switch is supplied with its appropriate adapting rod already fitted and can be rotated through 360° around the rod axis to simplify installation and cable orientation.
Electrical Switching Capacity
Standard silver contacts provide the following maximum switching capacities:
Resistive Loads
✓ 250VAC – 2A
✓ 120VAC – 3A
✓ 30VDC – 3A
Inductive / Lamp Loads
✓ 250VAC – 0.3A
✓ 120VAC – 0.5A
✓ 30VDC – 1A
Gold alloy contacts are also available as an option for applications involving very low electrical loads.
Installation
The PCSHP is designed for straightforward installation onto the dedicated position-monitoring connection of the VMH actuator.
The adapting rod mechanically follows the valve mechanism, allowing the switch to detect the actual valve plate position. The compact switch housing can be rotated through 360° to provide convenient electrical connector orientation.
This makes the PCSHP suitable both for new VMH installations and for field installation onto compatible existing VMH valves.
ATEX Hazardous Area Option
An ATEX version is available for hazardous-area installations.
The Elektrogas ATEX execution is suitable for:
✓ ATEX Category II 3G / 3D
✓ Gas Zone 2
✓ Dust Zone 22
✓ Ex nR IIA T4 Gc X
✓ Ex tc IIIC T135°C Dc X
✓ IP65 Protection
The ATEX version complies with Directive 2014/34/EU when specified on the product.
Biogas & Aggressive Gas Option
A special J version is available for aggressive gases including biogas and coke oven gas (COG).
This configuration uses special seals and eliminates non-ferrous metals where required for the specified gas service.
Typical Applications
✓ VMH Gas Safety Shut-Off Valves
✓ Industrial Gas Burner Systems
✓ Gas Trains & Burner Controls
✓ Gas Proving Systems
✓ Boiler Safety Systems
✓ Industrial Furnaces & Kilns
✓ Process Heating Equipment
✓ CHP & Energy Generation
✓ PLC Valve Status Monitoring
✓ Burner Management Systems
Why Use a PCSHP?
An electrical command telling a VMH actuator to close does not itself prove that the gas valve plate has physically reached its closed position.
The PCSHP provides mechanical feedback from the valve mechanism, allowing the control or safety system to confirm closure before the next stage of the burner or gas proving sequence.
Its compact construction, EN161 closed-position detection, simple field installation and compatibility with every VMH size make the PCSHP the dedicated proof-of-closure solution for the Elektrogas VMH range.
Ordering Information
PCSHP – Standard proof-of-closure switch for all VMH models, maximum operating pressure 500 mBar.
6PCSHP – 6 Bar proof-of-closure version.
Optional versions include:
✓ X – ATEX Zone 2 / Zone 22
✓ J – Biogas / COG Version
✓ B – Gold Alloy Contacts
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