Flowserve Valtek Beta Positioners for Control Valves User Manual

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

Figure 7: Beta Positioner with NT 3000 Transducer

3. If not welded to the stem clamp, bolt the take-off arm

to the stem clamp so that the arm curves upward
(toward the cylinder). The holes in the follower arm
(31) should line up with the slots in the take-off arm
(again refer to Figure 3).

4. Referring to Figure 6, install the cam (27), cam shaft

(29) and follower arm (31) for the proper air action.
For air-to-open action, the cam should be installed
with the letters L-R facing toward the cam shaft and
the return spring should be fed into hole “A.” For air-
to-close action, the L-D side of the cam should face
toward the cam shaft and the return spring should
be fed into hole “B.”

5. Feed the appropriate stroke follower arm (31) onto

the cam shaft boss (29) with the hole markings
facing outward. Fasten securely with the lock
washer (32) and nut (33).

6. Mount positioner on the bracket. Connect the

follower arm (31) and take-off arm together with
follower pin (62). Connection must allow free
movement of follower arm.

CAUTION: Be certain to lubricate the follower
pin and take-off arm where contact is made to
prevent premature wear. A light industrial
grease is recommended. Failure to do so can
cause premature wear, resulting in equipment
failure and possible personal injury.

7. For air-to-open (air-to-retract) air action, tube “out-

put 1” to the bottom and “output 2” to the top of the
cylinder. For air-to-close (air-to-extend) action, tube
“output 2” to the bottom and “output 1” to the top of
the cylinder.

8. Attach air supply and instrument tubing, using

inch NPT tubing connections.

CAUTION: A 3-15 psi instrument signal is rec-
ommended on the pneumatic module. High air
pressure may damage the module; the module
is limited to 30 psi.

Reversing Air Action on Linear Actuators

Reversing the air-action of the positioner is simple. No
additional parts are required, although the tubing will
need to be rerouted on the linear actuator.

To reverse the air-action on all sizes of Valtek linear
actuators:

1. Using Installation, Operation, Maintenance Instruc-

tions 2, reverse the air-action of the actuator.

2. Disengage the return spring from the cam and

remove the cam from the cam shaft.

3. Reverse the cam, return spring, and tubing for the

desired air-action by referring to steps 4-8 in the
“Installing Positioner on Linear Actuators” section of
this bulletin.

Zero Adjustment

Span Adjustment

Minimum Pressure
Cutoff Adjustment

Current Loop
Termination (+)

Current Loop
Termination (-)

Terminal Block

Range
Adjustment
Gear

Vent Screen

Spool Valve

Grounding Screw

Zero Adjustment Knob

Range Arm

Cam

Zero Adjustment Locking

Zero Arm

Range Adjustment
Locking Screw

Feedback Spring

Instrument Signal
Capsule

Mounting Screws