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Tandem arrangements
(for simultaneous opening of main and blocking valves)
Installation instructions for tandem arrangements
1. Review and comply with all general valve installation
instructions provided separately. (See sketch below.)
2. Mount both valves in fuel line with center to center
spacing as originally specified, and blocking valve
(without handle) downstream of main valve (with han-
dle).
3. Check valve alignment to be certain that operating
wheels lie in the same plane.
4. Remove tape from the wheel of the main valve and
unwind the attached chain. Do not remove the screw
holding chain to wheel; it has been factory positioned
to assure correct alignment. Do not remove tension
spring attached to one end of chain or the wooden
block insert which preloads the spring.
5. Take free end of chain and loop it around the wheels of
both main and blocking valve as shown in sketch
below. Depending on the specific valve series and
arrangement, tension spring may be located either
above or below the wheel centerline.
1) Tandem main valve
2) Tandem blocking valve
3) Tension spring
4) Piping by others
5) Flow direction
To add wheel & chain assembly to existing tandem
valves
1. Verify that both valves are in the same top assembly
position (TO or AW). Rotate if necessary. (See top
assembly rotation instructions on page 10-30.1-33.)
2. Bend handle of main valve outward about 25°.
E - i - 8/17
6. Draw free end of chain and tension spring together so
7. Crimp the "S" hook shut around the chain link, then
8. Remove spring preload wood block insert from the
9. Rotate the operating handle of the main valve fully to
10. Rotate blocking valve wheel fully counter-clockwise
11. Still holding main valve wheel in place, move blocking
12. Verify that the valves are wired in parallel as shown in
1
4
3. Cut off handle of blocking valve at outer wheel face.
4. Remove hardware holding main valve wheel in place
5. Cut chain loop to the desired length and secure to
7
GAS ELECTRO-MECHANICAL VALVES
that as much slack as possible is eliminated, then
insert the open eye of the spring "S" hook through the
link in the chain that will most nearly maintain this
position.
cut and discard excess chain.
tension spring, and verify that the chain is drawn tight.
latching position for your particular valve, then hold
handle firmly in this position while performing the
next few steps.
until it strikes a stop (it will slide within the loop of
chain).
valve wheel approximately 1/4 to 1/2 inch back in the
clockwise direction. Insert the #10-24 X 1/2" screw
(furnished) through the chain link that lines up with
the tapped hole on bottom of blocking valve wheel,
then fasten securely.
wiring schematic on page 13.
3
and mount new wheel and spacer to the existing wheel
with new hardware provided.
both wheels.
2
5
32M-95001—02
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