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5R V-9502 Series Pneumatic Valve Actuator Positioner less spring

Price: $252.32 
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SKU: ACT95P24
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Manufacturer: Johnson Controls

Description: 5R POSITIONER LESS SPRING
Category: Valve Actuators


V-9502 Series Pneumatic Valve Actuator Positioners

V-9502 Series Pneumatic Valve Actuator Positioners are precision relay devices designed to operate pneumatic valve actuators in applications requiring stable, accurate control. These positioners provide maximum positioning power to resist external forces that might otherwise overcome the positioning power of the actuator. Adjustable operating span (on all pneumatic valve actuators except the V-3000 Series) and starting point also make the V-9502 ideal for valve sequencing applications.
The V-9502 Series can be mounted directly to V-3000 Series, 3R, 4R, 5R, 8R, or MP8000 Series pneumatic valve actuators.

Features and Benefits
�� Maximum Positioning Power - Compensates for flow surges in the piping system, and holds the valve at the position dictated by the controller
�� Field-Selectable Operating Span (All Pneumatic Valve Actuators Except V-3000 Series) Allows for easy valve sequencing from a single control signal
�� Field-Adjustable Starting Point - Tailors the starting point in order to provide accurate control
�� Expanded Usability Provides application flexibility since models can be mounted directly to V-3000 Series, 3R, 4R, 5R, 8R, and MP8000 Series Pneumatic Valve Actuators

Operation
Feedback from the actuator stem (through the positioner spring and lever arm assembly) activates the V-9502 Pneumatic Valve Actuator Positioner to compensate for flow surges in the piping system and holds the valve at the position dictated by the controller. The V-9502 modulates the stroke of the actuator in relation to a pressure change from the controller.

Supply air enters the control chamber of the relay and is admitted to the actuator when the control pressure in the pilot chamber exceeds the preestablished starting point. This pressure causes the actuator stem to move. Movement of the stem is fed back to the relay through the positioner spring and lever arm assembly, to impose a balancing force against the control pressure. When all forces are in balance, the V-9502 does not allow supply air to pass through to the actuator. The actuator establishes a position that is proportional to the value of the pressure from the controller. Any change in stem position unbalances the relay. As a result, air pressure in the actuator increases or is exhausted in order to reestablish a balance at the desired stem position. Operating Range The span and starting point adjustments of the V-9502 Pneumatic Valve Actuator Positioner determine the operating range. The lower value of the operating range is the control signal pressure at which the actuator just begins to stroke. The upper value of the operating range is the control signal pressure at which the actuator reaches its maximum stroke. The difference between the upper and lower values of the control signal pressure is the operating span.

Operating Span
The operating span of the V-9502 Pneumatic Valve Actuator Positioner is field selectable from 3 to 13 psi (21 to 90 kPa) on 3R, 4R, 5R, 8R, and MP8000 Series pneumatic valve actuators. The operating span is determined by the location of the spring in the positioner operating span lever arm. When the spring is installed in the hole closest to the V-9502 Positioner cover, the spring allows a span of 3 psi (21 kPa). When the spring is installed in the hole farthest from the positioner cover,
the spring allows a span of 13 psi (90 kPa). The operating span for V-3000 Series Pneumatic Valve Actuators is determined by the positioner spring used with the actuator. To change the operating span, simply select a different positioner spring. In all instances, the spring should be installed in the hole on the operating span lever arm that is farthest from the positioner body.

Starting Point
The starting point is the input pressure (Pilot P pressure) at which the actuator just begins to stroke. The starting point is field adjustable from 2 to 12 psig (14 to 83 kPa) using the starting point adjusting screw located under the V-9502 Positioner cover. Turning the screw clockwise decreases the starting point and turning the screw counterclockwise increases the starting point. Note: The sum of the starting point pressure and the operating span must not exceed the supply air pressure to the V-9502 Pneumatic Valve Actuator. A nominal supply pressure is typically between 20 and 25 psig (138 and 172 kPa). Be certain to maintain a starting point pressure and corresponding operating span accordingly.

Mounting Methods
Most V-9502 Pneumatic Valve Actuator Positioners are furnished with a mounting bracket for attachment directly onto the actuator yoke. For V-3000 Series Pneumatic Valve Actuators, the V-9502 Positioner is installed directly onto the side of the actuator. Regardless of the actuator chosen, be certain to allow enough clearance for removal of the V-9502 Positioner cover and adjustment of the relay.

Replaces Part Numbers:V-9502-4, CARV-9502-4


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