The VMM type valve is a combination of two solenoid valve in an only compact and versatile valve huosing.
The first valve is a fast opening safety solenoid valve. The second valve may be a fast opening or a slow opening solenoid valve to adjust the gas flow, with a first adjustable fast stroke and a second adjustable slow stroke. It is possible connect a third by-pass / pilot valve, which performs by driver stage or to obtain a second fast (slow) stroke or both.
This type of device is suitable for air or gas blocking and releasing controls (with one or two stages operation), required in gas power burners, atmospheric gas boiler, industrial klins and in all gas equipments which use regulating trains.
Table of Contents
Function and Application
The VMM type valve is a safety shutting device using auxiliary power supply. The first valve (A) is a fast opening safety solenoid valve.When it is de-energized, the spring pushes on the seal disc, keeping the gas passage closed. Now, the inlet chamber is under the gas line pressure, and it forces on the disc too, improving the seal.
If the power supply is shut off, the valve rapidly closes, interrupting the gas flow. Equally, the second valve (B) may be a fast opening or a slow opening solenoid valve to adjust the gas flow, with a first adjustable fast stroke and a second adjustable slow stroke. It is possible to connect a third by-pass valve (C), which works as low fire stage or to obtain a second fast (slow) stroke or both.
|Connections||Gas threaded ISO 7-1 from Rp3/4 to Rp2 or ANSI-ASME B1.20 from 3/4″ NPT to 2″NPT|
|Flanged PN16 – ISO 7005 from DN40 to DN80 or ANSI-ASA-ASME B16.5 class 150 from 2″ to 3″|
|By-pass size||DN15 or DN25|
|Voltage rating||230 VAC 50/60 Hz|
|120 VAC 50/60 Hz|
|110 VAC 50/60 Hz|
|Voltage tolerance||-15% / +10%|
|Power consumption||70W for 3/4″ – 1″|
|90W (working) for 1″1/4-3″|
|by-pass 1/2″ 25W|
|by-pass 1″ 35W|
|-15 C / +60C (+5F to +140F)|
|Max. operating pressure||200 mbar (3 psig)|
|500 mbar (5 psig)|
|Body test pressure||1 bar (15 psig)|
|Flow capacity||see charts|
|Closing time||< 1 second|
|Pressure ports||G1/4 (add. G1/8 into flange models)|
|Gas trainers||600 m (0.02 in), metal mesh|
|Enclosure||IP54 (NEMA 3)|
|Optional IP65 with cable (NEMA 4)|
|Cable gland||M20x1,5 for terminal box|
|PG 9 for ISO plug|
|Wires cros-section||2,5 mm2 max. (AWG 12) for terminal board|
|1,5 mm2 max (AWG 14) for ISO plug|
|Electrical safety||Class I (EN 60335-1)|
|Coil winding insulation||Class H (200C, 392F)|
|Coil thermal resistance||Class F (155C, 311F)|