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

Actuator Disassembly
Loosen the stem connector bolt (20) and nut (19), 1.
and remove the stem connector (18).
Remove the actuator assembly from the valve by
2.
removing the four adapter plate bolts (22) and lifting
the actuator off the yoke (21).
Release the spring compression by threading the
3.
actuator stem (24) out of actuator, being careful not
to loosen the actuator stem locknut (44) or move the
stem adapter (43) (on 1/2” to 2” sizes).
Remove the actuator case bolts (29) and nuts (30)
4.
and lift the upper actuator case (28) off of the lower
actuator case.
Lift the diaphragm assembly out of the actuator case
5.
(27).
Loosen and remove the two actuator bolt locknuts
6.
(36). Remove the diaphragm plate (33) and dia-
phragm (34) from the actuator.
Clean all parts with a good quality solvent. Remove
7.
encrusted material with crocus or very fine alumi-
num oxide cloth. Inspect all parts for excessive wear
and/or damage and replace worn or damaged parts.
Use only Jordan Valve Replacement Parts. The use
of other than genuine Jordan Valve parts may impair
their ability to function properly.
Actuator Reassembly
Assemble the diaphragm stops (32), diaphragm (34), 1.
and diaphragm plate (33) to the actuator bolt (35).
Assemble and tighten the two actuator bolt lock nuts
(36) making sure that they are locked together.
Place the diaphragm assembly (from step 1) on the
2.
upper actuator case (28) with the diaphragm plate
(33) up. Place the springs (37) on the diaphragm
plate so they nest the formed bosses. Assemble the
lower case (27).
Replace four of the actuator case bolts (29) and
3.
nuts (30) at 90° and tighten finger-tight. Thread the
actuator stem (24) (with the stem adapter (42) for
the 1/2” to 2” sizes) onto the actuator bolt (35) until
the shoulder on the stem connects the adapter plate
and a slight amount for spring compression can be
felt.
Reassemble the actuator assembly to the yoke using
4.
the four adapter plate bolts (22).
Reconnect the actuator stem (24) to the valve stem
5.
(10) using the stem connector (18) and its bolt (19)
and nut (20).
Adjust the spring preload as shown in Spring Adjust-
6.
ment.
Valve Stroke Adjustment
1/2” to 2” sizes: 1. loosen the stem connector nut
(20), only enough to allow the stem adapter (43) to
rotate. Do not remove the stem connector (18).
Proper positioning of the valve stem and the stem
adapter (43) must be maintained while adjusting the
seats.
2-1/2” to 6” sizes:
2. remove the seats as outlined
under Valve Seats and loosen the disc pin locknut
(9). Put the seats back in place. Loosen the stem con-
nector nut (20) only enough to allow the stem (19)
to rotate. Do not remove the stem connector (18).
Proper positioning of the valve stem (10) and actua-
tor stem (24) must be maintained while adjusting the
seats.
Direct Acting (air-to-close) Valves:
3. thread the actua-
tor stem (24) onto the actuator bolts (35) until the
springs are slightly compressed. This insures that the
actuator stem is slightly compressed. This insures that
the actuator stem is in its fully upward position. To
confirm that the actuator stem is fully stroked down,
check that it cannot be rotated easily with a wrench.
Reverse Acting (air-to-open) Valves:
4. apply an air
pressure to the actuator of approximately 5 psi
above the maximum range pressure (i.e. 20 psi for
3-15 psi range). This should stroke the actuator stem
fully down. To confirm that the actuator stem is fully
stroked down, check that it cannot be rotated easily
without a wrench.
1/2” to 2” sizes:
5. the orifices in the disc (6) and plate
(5) must be perfectly aligned in the open position. If
they are not, loosen the actuator stem locknut (44)
and rotate the stem adapter (43), which moves the
disc pin (8) and disc (6) up or down on the plate.
2-1/2” to 6” sizes:
6. the orifices in the disc (6) and
plate (5) must be perfectly aligned in the open posi-
tion. If they are not, adjust the alignment of the ori-
fices by rotating the valve stem (10), which moves the
disc pin (8) and disc (6) up or down on the plate (5).
1/2” to 2” sizes:
7. after proper alignment has been
achieved, tighten the locknut (44) against the end of
the actuator stem (43). Recheck the seat adjustment.
2-1/2” to 6” sizes:
8. after proper alignment has been
achieved, remove the seat assembly and carefully
tighten the disc pin locknut (9), taking care not to
rotate the disc pin (8). Replace the seats and recheck
the seat alignment.
Adjust the spring preload as shown in
9. Spring Adjust-
ment.
Spring Adjustment
Note: Actuators arranged for 3-15 range, Reverse Air-To-
Open: Jordan control valves rated 3-15 psig, ATO, are
bench set at the factory at 5-17 psig. Please insure that
any I/P utilized with this control valve is capable of 17 psig
output to insure full valve travel. If desired, the range may
be changed to suit your needs by following the instruc-
tions below.
The signal range (3-15 psi or other) is preset by Jordan
Valve. When the valve is installed, however, this range
may shift slightly due to pressure drops across the valve.
-4-