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Summary of Contents for Elektrogas VMH Series
- Page 1 Safety shut off valves for gas with hydraulic actuator DN65 … DN300 delta-elektrogas.com...
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Page 2: Table Of Contents
ELEKTROGAS – Technical Sheet EE175 - 1020 Contents Description ………………………………………….. 3 Features …………………………………………….. Functioning and application ………………………. Special versions and optionals …………………… Technical specifications …………………………… 5 Gas flow chart (pressure drop) …………………… Standards and approvals …………………………. Ordering information ………………………………. 10 Installation, adjustment and servicing ………….. -
Page 3: Description
ELEKTROGAS – Technical Sheet EE175 - 1020 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,... -
Page 4: Functioning And Application
ELEKTROGAS – Technical Sheet EE175 - 1020 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. -
Page 5: Special Versions And Optionals
ELEKTROGAS – Technical Sheet EE175 - 1020 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 and 22, according to... - Page 6 ELEKTROGAS – Technical Sheet EE175 - 1020 Fig. 3 Tab. 2 Flow Overall dimensions [mm] Opening Pmax Weight Max cycles Model Conn. time * per hour * [bar] [Kg] [sec] [m³/h] VMH7 * DN 65 10..15 83,0 4x18 VMH8 * DN 80 10..15...
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Page 7: Gas Flow Chart (Pressure Drop)
ELEKTROGAS – Technical Sheet EE175 - 1020 Gas flow chart (Pressure drop) Fig. 4 Formula of conversion Tab. 3 Gas type Density from air to other gases ρ [Kg/m³] 1,25 1,00 Natural gas 0,80 1,25 Town gas 0,57... - Page 8 ELEKTROGAS – Technical Sheet EE175 - 1020 In the flow chart we read that in a VMH8 - DN80 valve with a Natural Gas flow of 200 Nm /h there is a pressure drop ∆p = 4,0 mbar. If we consider that 200 m /h is the flow at 1.
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Page 9: Standards And Approvals
ELEKTROGAS – Technical Sheet EE175 - 1020 Standards and approvals The valves are designed and manufactured according to European Regulation on Gas appliances 2016/426/UE (GAR) and the certification has been issued by the notified body Kiwa Nederland B.V. – reg. n° 0063CO1798 (*). -
Page 10: Ordering Information
ELEKTROGAS – Technical Sheet EE175 - 1020 Information Tab. 4 Valve type VMH Connections size and operative pressure 7 = DN65 1.6bar 8 = DN80 1.6bar 9 = DN100 1.3bar 93 = DN125 0.5bar 93U = DN125 1.3bar 95 = DN150 0.5bar 95U = DN150 1.3bar... -
Page 11: Installation, Adjustment And Servicing
ELEKTROGAS – Technical Sheet EE175 - 1020 Installation, adjustment and service To assure a proper and safe operation, as well as a long life of the valve, installation procedure and periodical servicing are very important topics and the following instructions should be always fulfilled. - Page 12 ELEKTROGAS – Technical Sheet EE175 - 1020 Remove the end caps and make sure no foreign body is entered into the valve during handling. Position the gasket or sealing agent on the flanges and insert the bolts with washers. Screw the nuts tightening them crosswise and using proper tools only. Avoid overtightening and mount tension free.
- Page 13 ELEKTROGAS – Technical Sheet EE175 - 1020 ELECTRICAL CONNECTION (IEC 730-1) - Using a screwdriver remove the plug from the actuator. - Unscrew the gland-nut (G) and remove the washer (F) and grommet (E). - To remove the terminal block (A)
- Page 14 ELEKTROGAS – Technical Sheet EE175 - 1020 Fig. 8 WARNING Adjustments below 40% of capacity are unadvisable because they may cause turbulence. PCS (closed position indicator switch) mounting All VMH valve can be equipped with PCSHP (closed position indicator switch for VMH actuator).
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Page 15: External Inspection
ELEKTROGAS – Technical Sheet EE175 - 1020 To maintain a good performance of the system, almost once a year, an external inspection of the valve is recommended. Due to seals aging, to ensure safe operation, we recommend valve replacement after 10 years from the date of manufacture stamped on the product. -
Page 16: Actuator Replacement
ELEKTROGAS – Technical Sheet EE175 - 1020 ACTUATOR REPLACEMENT Before starting with actuator replacement, make sure it is the cause of failure. To replace the actuator do the following: Make sure an identical spare part is available. Switch off power supply and remove the plug (8).
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