Jordan Valve Mark 70 Series – Sliding Gate Control Valve - Manual (Page 4)

following the instructions below.
Remove the air signal line from the actuator and 1.
replace with a pressure gauge and an air regulator.
Loosen, but do not remove, the stem connector
2.
bolt and nut (21, 22).
Adjust the actuator air pressure to just below the
3.
starting point of the range and rotate the actuator
stem (23) until the stem just starts to move. Contin-
ue to rotate the actuator stem about one-half turn.
Remove the air pressure. Increase the air pressure
and check the pressure at which the valve just
starts to move. Repeat actuator stem adjustment if
necessary and again check pressure at which the
stem starts to move.
After the preload has been properly adjusted, tight-
4.
en the stem connector bolt and nut, and reattach
the control air line.
Changing Valve Action
The action of a Sliding-Gate valve may be changed from
DIRECT ACTING to REVERSE ACTING, or vice versa, by
rotating the disc (5), plate (4), and valve cap (2) 180°.
Check the valve stroke and orifice alignment and adjust,
if required, as outlined in the Valve Stroke Adjustment
section.
5 3
1
6 4
2
5
3
1
6 4
2
7
8
6 bolts
(or multiples)
8 bolts
(or multiples)
-4-
(28, 29) at 90° and tighten finger-tight. Replace the
remaining bolts and nuts and tighten evenly across
the actuator case.
Thread the actuator stem onto the actuator bolt
4.
until the shoulder of the stem contacts the adapter
plate (25).
Reassemble the actuator assembly to the valve
5.
yoke (18) using the four screws (24).
Reconnect the actuator stem to the valve stem (10)
6.
using the stem connector and its bolt and nut.
Adjust the spring preload. (See Spring Adjustment.)
7.
Valve Stroke Adjustment
Loosen the stem connector nut (22) only enough to 1.
allow the stem adapter (38) to rotate. DO NOT RE-
MOVE the stem connector (20). Proper positioning
of the valve stem (10) and the stem adapter (38)
must be maintained while adjusting the seats.
For Direct Acting (Air-to-Close) Valve: Thread the
2.
actuator stem (23) on the actuator bolt (35) until
the springs (34) are slightly compressed. This in-
sures that the actuator stem is in its fully upward
position. To confirm that the actuator stem is fully
stroked up, check that it cannot be rotated easily
without a wrench.
For Reverse Acting (Air-to-Open) Valves: Apply an
3.
air pressure of approximately 5 psi above the maxi-
mum range pressure (ex. 20 psi for 3-15 psi range)
to the actuator. This strokes the actuator stem (23)
fully down. To confirm that the actuator stem is
stroked fully down, check that it cannot be easily
rotated without a wrench.
Check the alignment of the orifices in the disc and
4.
plate. The orifices must be in the open position
and in perfect alignment. If the orifices are not
in proper alignment, loosen the locknut (37) and
thread the stem adapter (38) into, or out of, the ac-
tuator stem (23) which will move the disc (5) up, or
down, on the plate (4).
After proper alignment has been obtained, tighten
5.
the locknut (37) against the end of the actuator
stem (23). Recheck the seat adjustment.
Adjust spring preload if necessary. See the Spring
6.
Adjustment section.
Spring Adjustment
The signal range is preset by Jordan Valve; however,
when the valve is installed this range may shift slightly
due to pressure drops across the valve. Additionally,
preload adjustment may be required after one of the
previous maintenance procedures. Note: ATO 3-15
psig rated valves are bench set at factory at 5-17 psig.
Please insure that any I/P utilized with this control valve
is capable of 17 psig output to ensure full valve travel. If
desired, the range may be changed to suit your needs by
Valve Size
Valve Body Material
Bronze Ductile Iron, Cast Steel,
Stainless Steel
1/2” & 3/4” 140 200
1” & 1-1/4” 140 200
1-1/2” & 2” 140 200
Torque for Bolts (3) Connecting
Valve Cap to Valve Body (in. - lbs.)