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Option Installation; Warning; Construction And Working Principles - Honeywell VQ400M Series Product Handbook

Class “a” combination valves
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VQ400M-Series

OPTION INSTALLATION

Installation can be done by the OEM or by qualified
personnel in field.

WARNING

If additional hardware needs to be installed on field,
then installation personnel should take care, that
the main gas flow to the appliance has been
completely stopped by an upstream manual shut-
off valve prior to the installation.
Installation
1. Open the required gas flow channels by
removing the suitable plugs from the valve
body.
2. Take care that dirt can not enter the gas
valve during handling
3. Install the screw-in additional hardware as
required (vent, by-pass, external pilot
valve)
4. Please refer to the relevant instruction
sheet
HONEYWELL
HONEYWELL
HONEYWELL
HONEYWELL
CONSTRUCTION AND WORKING
PRINCIPLES
The VQ400M combination gas valves are 2 x class
"A" fail safe shut-off valves. The valve is opened by
energizing the direct ON / OFF operator. The direct
ON / OFF operator consists of a coil and stop
sleeve assembly. Inside the top sleeve assembly a
plunger is placed which is able to move up and
down and thus opening or closing the valve. The
plunger is gliding on two anti-friction bearings. Flow
regulation is done by adjustable plunger stroke. A
strainer made out of steel AISI 303 is incorporated
between inlet flange and main body. Valve closing
springs are made out of steel AISI 302. Seals and
gaskets are manufactured out of hydrocarbon
resistant NBR according to DIN 3535 and EN291.
Electro-magnetic
actuator
Moveable valve to
open / close flow
channel
Automatic closing mechanism
when power is switched off
Figure 14 Schematic drawing of VQ400M.
13
CLASS "A" COMBINATION VALVES
Slow opening
device
Flow direction
SECTION A-A
EN2R9081-C
October 2009

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