Metso Jamesbury Wafer-Sphere Series Operating Instructions Manual Download Page 8

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IMO-15

must be no pressure across the valve. Reread the
General Precautions section on pg. 4.

(a) Disc travel on a

Wafer-Sphere

valve with a Type

ST or ST-MS pneumatic actuator is controlled by
a closed ("shut") travel stop set screw (20A) and
by an open travel stop set screw (20B) in the
actuator. See Fig. 6.

(b) Remove acorn nuts (19) protecting the closed

("shut") and open stop set screws (20A) and
(20B), respectively. Note: Be sure O-rings remain
in the acorn nuts.

actuator driver.

(d) Unscrew closed (shut) stop set screw (20A) far

enough to accomplish step (e).

(e) Close the valve. With ST-MS actuators, allow

spring to overclose the valve. (Now the disc
should be resting on the insert stop.)

(f ) Carefully turn the closed (shut) stop set screw

(20A in Fig. 6) in, or clockwise, until increased
resistance to further motion is felt. Turn the
screw in an additional 1/8 turn. At this point,
there will be a slight movement of the driver
(2), and the pointer (24) will just begin to move,
and the disc will come off the insert stop.

(g) Cycle the valve open and back to closed several

times. The pointer (24) should return to the
same position each time.

(h) Cycle the valve to the open position. If neces-

sary, adjust the open stop set screw (20B) until
the pointer (24) is approximately 90° from the
closed (shut) position. This is full open.

(i) With the valve in the full open position, and

with air applied so that load is applied to the
open stop set screw to prevent it from moving,
cover the open stop set screw (20B) with an
acorn nut. Tighten the open stop set screw
acorn nut.

(j) Now close the valve. With the valve in the

closed position, and air applied, cover the
closed stop set screw acorn nut (19) and tight-
en it.

(k) Cycle the valve open and closed, with full air

pressure, three times. The disc must not touch
the insert stop. The pointer should return to the
same position each time. Visually check to see
that the disc is not touching the insert stop in
the closed setting.

(l) Check all linkages and coupling bolts for tightness.

Recommended torque values are as follows:

NOTE: Type ST-MS safety return actuators can only
operate in the fail-close direction.

2. Quadra-Powr® Sprinq-Diaphragm Actuators:

Follow the instructions for adjustment of ST-MS
actuator with the following exceptions:

(a) The

Quadra-Powr

has no acorn nuts on the stop

screws.

(b) Because the stop screws can be held in position

while tightening the jam nuts, there is no need
to apply a load to the ends of the screws during
this operation (steps (i) and (j) of Section IX #1).

NOTE: The

Quadra-Powr

spring-diaphragm can be

set up to operate in either the fail-open or fail-
close position.

3. Type MA Manual Gear Actuators:

Disc travel on a

Wafer-Sphere

valve with a Type MA

manual gear actuator is also controlled by a closed
(shut) travel stop set screw and an open travel stop
set screw.

(a) Adjust actuator travel stops by following essen-

tially the same procedure as described in #1
above for Type ST pneumatic actuators; set the
two stop set screws of the actuator so as to pre-
vent disc over-travel.

(b) Turn the handwheel so that it closes the valve.

clockwise, until it stops. This will provide the
proper closed setting.

(d) Tighten the jam nuts on the stop set screws.

Maintain force on the stop set screws while
tightening the nuts by applying torque to the
actuator handle.

4. Type EJ, ERC, and ERCX Electric Actuators:

CAUTION: If an electric actuator's closed (shut)
position switch adjustable cam (9) is not properly
adjusted, the valve disc may contact the travel stop
before the switch has been tripped. In this case, the
actuator motor will continue to run, with possible
damage resulting.

(a) Disc travel on a

Wafer-Sphere

valve with Type EJ,

ERC, or ERCX electric actuators is controlled by a
closed (shut) travel switch cam and by an open
travel switch cam.

(b) Proper settings are obtained by adjusting the

appropriate switch cams within the actuator
housing to position the valve disc in the proper
open and closed positions. NOTE: Refer to the
applicable

Jamesbury

Installation, Maintenance,

and Operating instruction (IMO) for identifica-

Standard Torque Tables

Bolt Size

1/4"