November 2022
Installation, Operation and Maintenance Manual
MAC050515 EN Rev. 0
24
Bottom Mounted Stop Block
Section 11: Bottom Mounted Stop Block
11.6
Assembly to Valves for Reverse
Action Configuration
Double-Acting and Fail-Safe Counterclockwise (usually to Fail Open the Valve):
1.
Make sure the valve is in the OPEN position if it is to Fail OPEN and in the CLOSED
position if it is to Fail CLOSED.
2.
Assemble the mounting bracket to the valve with the open part of the bracket in
line with the direction of flow through the valve.
3.
Assemble the long shaft adaptor to the valve stem.
4.
Take the stop block assembly making sure the arrow cast into the quadrant is
facing toward the single indent on the top of the stop block assembly.
5.
With the quadrant held in this position, the pointed dowels (refer to Figure 8)
facing upwards and the stop bolts facing towards the closed side of the mounting
bracket, place the stop block assembly over the square drive shaft of the long shaft
adaptor onto the top face of the mounting bracket. The shallow recess is now on
the underside next to the bracket.
NOTE:
The dowel pins assembled with pointed end facing towards actuator bottom,
gives additional grip between actuator and stop block when securely fastened by the
mounting studs.
6.
Lower the actuator onto the adaptor, checking that the actuator is in the NORMAL
position (pistons together) with the solenoid mounting face towards you and
screw the four (4) fixing studs through the mounting bracket, through the stop
block into the actuator base (refer to Figure 9).
7.
Ensure that the studs are screwed into the actuator until they bottom in the hole.
8.
Fit washers and nuts onto the studs.
9.
Using a torque wrench, tighten the studs to a torque of 175 Nm (130 lbf-ft).
10.
Adjust the Stop Bolts to the desired position.
11.7
Long Shaft Adaptor Dimensions and Materials
It is very important that the drive adaptor is manufactured from the correct strength
material and Hytork can provide blank adaptors to the dimensions indicated that only have
to be machined for the valve end (refer to Figure 10).
Adaptor Material: AISI 1040
or BS970 Pt1 1983 080M40 (EN8)
dia
Figure 10
Long shaft adaptor dimensions and material
