Flowserve Valtek Valdisk User Instructions page 17

position, secure the retainer or metal seat in place by
tightening the retainer clips and screws. This allows the
seat to align with the disk, permitting tight shutoff. Gaskets
with a soft seat are optional. If required, place the gasket in
the appropriate body groove.
Table 4: Shaft flange bolting torques.
Valve Size Pressure
(in) Class
150
3
300
600
150
4
300
600
150
6
300
600
150
8
300
600
150
10
300
600
150
12
300
600
150
14 300
600
150
16
300
600
150
18 300
600
150
20
300
600
150
24
300
600
Contact manufacture for valve sizes and torque values not
shown.
VAIOM000286-02 (EN/AQ) May 2023
Torque
ft-lbs N-m
7 ± 1 10 ± 1
7 ± 1 10 ± 1
7 ± 1 10 ± 1
7 ± 1 10 ± 1
14 ± 2 19 ± 2
26 ± 3 36 ± 4
7 ± 1 10 ± 1
14 ± 2 19 ± 2
26 ± 3 36 ± 4
14 ± 2 19 ± 2
14 ± 2 19 ± 2
53 ± 5 71 ± 7
14 ± 2 19 ± 2
26 ± 3 36 ± 4
53 ± 5 71 ± 7
26 ± 3 36 ± 4
26 ± 3 36 ± 4
88 ± 9 119 ± 12
26 ± 3 36 ± 4
26 ± 3 36 ± 4
70 ± 7 95 ± 10
26 ± 3 36 ± 4
53 ± 5 71 ± 7
105 ± 11 143 ± 14
53 ± 5 71 ± 7
88 ± 9 119 ± 12
131 ± 13 179 ± 18
53 ± 5 71 ± 7
61 ± 6 83 ± 8
131 ± 13 179 ± 18
53 ± 5 71 ± 7
114 ± 11 155 ± 15
193 ± 19 262 ± 26
Valtek Valdisk High-Performance Butterfly Control Valves
13. On large Valtek Valdisk valves supplied with seat retainer
screws, install the insert and retainer into the body with the
disk open. Loosely install the retainer screws, then close
the disk. Tighten the screws after the closed disk has
centred the seat. This allows the seat to align with the
disk, permitting tight shutoff.
Remounting Actuator to Valve
Before mounting a Valtek actuator on the valve body, verify that
the disk rotation matches the actuator rotation and complies with
the air failure requirements. The procedure for mounting the
actuator to the valve is as follows:
1. Slide the entire actuator assembly onto the shaft. If
necessary, on Valtek actuator designs with clamping lever
arm design, wedge the splined lever arm apart to loosen it
on the shaft splines. For full rotation of the disk, marks
provided on the end of the shaft and on the lever arm
should be aligned.
2. Bolt the actuator yoke to the valve body. Be certain the
stroke indicator plate is positioned properly to accurately
indicate the valve's rotation.
3. Position the actuator lever arm on the shaft so the actuator
stem is centered in the transfer case. Firmly tighten the
linkage bolt, on clamping lever arm actuators.
On clamping lever-arm actuators, do
not apply air to the actuator without the
cover plate installed; otherwise, the unsupported shaft may
sustain damage.
4. Adjust the actuator stroke stop bolts until the disk is parallel
to the seat surface, but not resting on body disk stop.
Actuator stroke stop bolts must be
properly adjusted to prevent the valve
disk from over stroking. If incorrectly adjusted the valve
shaft may be twisted or sheared off when it contacts the
body stop.
5. Install valve in line as outlined in Installation section.
Page 17 of 22