Description
Delta-Electrogas VMH Safety Shut Off Valves DN65 – DN300 is a safety shut off valve for gas with a 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.
History Of DELTA
1961 – Elettromeccanica DELTA s.p.a. was founded in Arcade (TV) with the aim of designing and manufacturing oil burners with mechanical atomization. 2011 – Elektrogas range celebrates 30 years in the market, with a product portfolio that now includes control valves, filters, gas regulators, servomotors, and combustion controllers. Today – Elettromeccanica DELTA, with its brands Elektrogas and Deltapumps, is a proud manufacturer of safety and control products for gas firing systems and fuel oil appliances, successfully installed in more than 60 countries in the world.
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.
Applications
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.
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.
Specifications
Connections Flanged PN16 – ISO 7005 from DN65 to DN300
Voltage rating (-15%/+10%) 230 VAC or 110 VAC 50/60 Hz
Power consumption
20VA (START 110 W)
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 Aluminum alloy
Brass
Stainless steel
Plated steel
Anaerobic adhesive
Nitrile rubber (NBR)
Fluoro elastomer (FPM)
Polytetrafluoroethylene (PTFE)
ELEKTROGAS – T
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 2014/34/UE
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. For this kind of
installation, the customer has to check the compatibility between valve materials and gas
contents.
