VMH
Safety shut off valves for gas
with hydraulic actuator
DN65 … DN300
delta-elektrogas.com EE175 - 0117
ELEKTROGAS – Technical Sheet EE175 - 0117
VMH
Contents
Description ………………………………………….. 3
Features …………………………………………….. 3
Functioning and application ………………………. 4
Special versions and optionals …………………… 5
Technical specifications …………………………… 5
Gas flow chart (pressure drop) …………………… 7
Standards and approvals …………………………. 9
Ordering information ………………………………. 10
Installation, adjustment and servicing ………….... 11
Elektrogas® is a brand name of
ELETTROMECCANICA DELTA S.p.A.
Via Trieste, 132 - 31030 Arcade (TV) - Italy
Tel +39 0422 874068
Fax +39 0422 874048
www.delta-elektrogas.com
[email protected]
ELETTROMECCANICA DELTA S.p.A. reserves the right to update or make any technical changes without prior notice.
Copyright © 2017. All rights reserved.
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ELEKTROGAS – Technical Sheet EE175 - 0117
Description The VMH type valve is a safety shut off valve for gas with hydraulic actuator. It is suitable for air
or gas blocking and releasing controls, required in the main pipe of gas power burners,
atmospheric gas boilers, industrial kilns and others gas consuming appliances.
See Tab. 2 for maximum operative pressure for every model.
Features The valves are made of aluminum alloy with a range for connections from DN 65 up to DN 300.
Pipe connections meet group 2.
Suitable for use with air and non-aggressive gases included in the 1st, 2nd and 3rd families (EN
437).
Special versions for aggressive gases.
The valve is open only when energized: if, for any reason, power supply goes down, the valve
closes immediately (intrinsic safe).
Qualified for continuous service (100% ED).
Size DN65-80 is equipped with flow rate adjustment.
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination.
Provided with G1/4 pressure gauge on two sides in both inlet and outlet chamber to connect
manometers, pressure switches, leakage tester or other gas equipments.
The actuator is provided with ISO 4400 plug for easy cabling. The protection class is IP65 (EN
60529).
The actuator is provided with a led to visualize when it is energized.
All components are designed to withstand any mechanical, chemical and thermal condition
occurring during typical service. Effective impregnation and surface treatments have been used
to improve mechanical sturdiness, sealing and resistance to corrosion of the components.
Valves are 100% tested and fully warranted.
WARNING
This control must be installed in compliance with the rules in force.
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ELEKTROGAS – Technical Sheet EE175 - 0117
Functioning and
application The VMH type valve is a safety shutting
device using auxiliary power supply.
When it is de-energized, the spring pushes
on the seal disc, keeping the gas passage
closed. In this condition the inlet chamber is
filled with pressurized gas that forces on the
disc, improving the seal.
When the actuator is powered, the relief
valve closes, the pumps starts and the
pressurized oil pushes the piston. The disc
opens against the combined force of spring
and gas pressure.
When the disc reaches the end stop, the
pump is turned off and only the relief valve
is consuming power.
If the power supply is shut off, the relief
valve opens and the disc closes rapidly,
interrupting the gas flow.
Fig. 1 shows a sketch of a VMH valve.
Fig. 1
This kind of valve is normally installed as safety and regulating device in gas trains, for industrial
applications and gas firing systems. Fig. 2 shows an example of installation, in combination with
other Elektrogas devices.
Hydraulic
valve VMH Hydraulic
with PCS valve VMH Pressure Solenoid valve
regulator VMR-VML
Pressure
gauge Pressure
Ball Gas Filter switch
valve FG Valve PSG
leak
tester
Gas Consumer
network
Fig. 2
WARNING
Location and mode of installation must be in compliance with local rules in force.
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ELEKTROGAS – Technical Sheet EE175 - 0117
Special versions
and optionals A switch can be installed as a closed position indicator (see PCS datasheet ).
Whole range can be provided with Ex-proof execution for use in Zone 2, according to 94/9/EC
Directive (ATEX).
The whole range can be supplied in special version suitable for aggressive gases (i.e. biogas,
COG). This version is free of nonferrous metals and equipped with special seals.
Technical
specifications
Tab. 1
Connections Flanged PN16 – ISO 7005 from DN65 to DN300
Voltage rating (-15%/+10%) 230 VAC or 110 VAC 50/60 Hz
20VA (START 110 W)
Power consumption
Only for DN 250–300: 25VA (START 115W)
Ambient temperature -15°C / +60°C
Max. operating pressure see Tab. 2
Flow capacity see Tab. 2
Opening time see Tab. 2
Filter 600 µm, metal mesh
Protection class IP65 (EN 60529)
Cable gland Plug ISO 4400 with cable gland PG9
Materials in contact with gas Aluminium alloy
Brass
Stainless steel
Plated steel
Anaerobic adhesive
Nitrile rubber (NBR)
Fluoro elastomer (FPM)
Polytetrafluoroethylene (PTFE)
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ELEKTROGAS – Technical Sheet EE175 - 0117
Fig. 3
Tab. 2
Flow Overall dimensions [mm]
Opening
Pmax Max cycles Weight
Model Conn. time *1 Kvs
[bar] per hour *2 A B C D Int h [Kg]
[sec]
[m³/h]
VMH7 * DN 65 1,6 10..15 83,0 60 200 305 350 536 145 4x18 14
VMH8 * DN 80 1,6 10..15 92,0 60 200 305 350 536 160 8x18 14
VMH9 * DN 100 1,3 15..25 152,0 40 250 350 366 571 180 8x18 18
VMH93 * DN 125 0,5 25..40 250,0 30 310 460 461 671 210 8x18 34
VMH93U DN 125 1,3 25..40 250,0 20 310 460 461 671 210 8x18 34
VMH95 * DN 150 0,5 25..40 315,0 30 310 460 461 671 240 8x23 36
VMH95U DN 150 1,3 25..40 315,0 20 310 460 461 671 240 8x23 36
VMH98 * DN 200 0,2 35..50 476,0 20 370 546 494 730 295 12x23 52
VMH98U DN 200 1,3 35..50 476,0 15 370 546 494 730 295 12x23 52
VMH910U DN 250 1,3 40..60 660,0 15 405 600 560 852 355 12x28 59
VMH912U DN 300 0,6 45..75 970,0 15 460 700 596 923 410 12x28 106
* model with CE 0063CO1798 certificate
*1 opening time depends on ambient temperature, real voltage and…
