DeZurik G-SERIES Manual - Halaman 6

Jelajahi secara online atau unduh pdf Manual untuk Pengontrol DeZurik G-SERIES. DeZurik G-SERIES 14 halaman. Lift, turn and reseat used on ptw & pfw tapered plug valves
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Halaman Cetak
DeZurik G-SERIES Manual
DeZURIK
Cylinder Operated G-Series Actuator

Removing Actuator

When tapered plug valves are mounted in a vertical pipeline, or mounted in a horizontal pipeline with
the plug stem horizontal, gravity can cause the plug to swing to a lower position in the valve body when
the actuator is removed. To avoid this problem, place the plug in the lowest position before removing
the actuator.
1. Discontinue flow, relieve pipeline pressure and close valve.
Accidental operation of power actuator can cause personal injury or equipment damage.
Disconnect and lock out power to actuator before servicing.
2. Disconnect and lock out the pneumatic power to prevent accidental operation of the actuator.
3. Scribe corresponding lines on the valve and actuator to help align them during installation.
4. Remove the lock nut from the top of the wrenching square.
5. Remove the four socket head screws and wrenching square.
6. Note the position of the pointer, then remove the two socket head screws and slide the pointer
off the actuator.
7. Remove the plug adjusting nut from the stud and slide the bearing washer off the stud.
8. Note the stampings on the top of the valve plug stem. These stampings correspond with the
plug face as shown in Figure 3. It is important that the plug position be noted to ensure it is in
the correct position during actuator installation.
This valve is a pressure vessel. Removing the bonnet bolts before relieving pipeline pressure
can result in personal injury or equipment damage. Always relieve pipeline pressure before
removing the actuator.
9. Remove the screws fastening the adapter to the adaptor plate (2"- 4" valves) or to the valve
bonnet (5" - 16" valves).
10. Lift the actuator and adapter off the valve.
D10191
Figure 3 – Plug Stem Stampings
Page 6
July 2016