Pneumatic Positioner

Product catalog summary

Overview
The Posi-flate® Model 7000 Pneumatic Positioner is designed for precise valve positioning, utilizing a current-to-pressure transducer for 4-20 mA signal inputs to proportionally position the valve disc.

Applications
This positioner is suitable for all pneumatic rotary actuator types, including rack-and-pinion and heavy-duty actuators. It features a high flow spool valve and an adjustable gain system, housed in durable epoxy-coated die-cast aluminum for protection in harsh industrial environments.

Key Features

Non-interactive span adjustment: Reduces calibration time.
Corrosion-resistant materials: Constructed with anodized aluminum or stainless steel.
Captive cover screws: Allows calibration without losing screws.
Visual dome indicator: Provides adjustable, high-contrast viewing of valve position.

Principles of Operation
The positioner operates by causing rotation of a valve actuator in response to an input signal. The spool valve shifts, creating differential pressure across the actuator, which is then fed back through the positioner shaft and cam. Adjustments for zero and span are made via spring compression and rack-and-pinion adjustments, respectively.

Materials of Construction

Housing/Cover: Epoxy Coated Aluminum
Shaft: Stainless Steel
Diaphragm: Nitrile Rubber
Various components: Stainless Steel, Hardened Steel, Gold-Plated Steel

Performance Specifications

Repeatability: 0.5% Full Scale
Hysteresis & Deadband: 0.8% Full Scale
Linearity: 0.7% Full Scale
Air Capacity: Standard 9.6 SCFM, High 18 SCFM
Position Sensitivity: 0.2% of Span
Air Consumption: 0.31 SCFM @ 87 psig (6 barg)
Temperature Range: -4° F to 185° F (-20 C to 85 C)
Input Signal: 3 to 15 psig (0.2 to 1 barg)
Max. Supply Pressure: 150 psig (10 barg)
Weight: 2 lbs. (0.9 kg)

Contact Information
Posi-flate, St. Paul, MN USA, +1 651 484 5800. Offices in Brazil, China, New Zealand, and the United Kingdom. Visit www.posiflate.com for more information.

Catalog excerpts

Model 7000 Pneumatic Positioner Accurate Valve Positioning The Posi-flate Model 7000 Pneumatic Positioner provides accurate valve positioning with advanced features. A current-to-pressure transducer for 4-20 mA signal inputs proportionally positions the disc. ® Applications A high flow spool valve, plus an adjustable gain system, make the pneumatic positioner well suited for use with all pneumatic rotary actuator types including rack-and-pinion, heavy duty and others. The positioner housing is constructed of durable epoxy coated, die cast aluminum for protection against the toughest applications in all process industries. Features Non-interactive span adjustment Reduces calibration time. Corrosion-resistant materials All exposed parts are constructed of heavy-duty anodized aluminum or stainless steel. Captive cover screws Permits calibration without potential for losing screws. Visual dome indicator Provides fully adjustable, high-contrast, full-angle viewing of valve position.

Open the catalog to page 1

Principles of Operation The Posi-flate Model 7000 positioner causes rotation of a valve actuator in proportion to an input signal. The spool shifts and a differential pressure is created across the actuator, causing rotation. Rotation is fed back through the positioner shaft and cam. Cam rotation causes rotation of both follower arm and feedback arm about their respective pivot pins. Rotation of feedback arm changes compression in the feedback spring which forces the balance beam and spool back to their neutral positions. This shuts off the flow of air to the actuator. Zero adjustment is made...

Open the catalog to page 2

SPOOL VALVE ZERO ADJUSTMENT SPAN ADJUSTMENT (UNDER COVER) Materials of Construction Part Performance Specifications Parameter Units & Value Epoxy Coated Aluminum Stainless Steel Hysteresis & Deadband Diaphragm Cover Epoxy Coated Aluminum Nitrile Rubber Stainless Steel Feedback Spring Stainless Steel Position Sensitivity 0.31 SCFM @ 87 psig (6 barg) Stainless Steel Temperature Range Stainless Steel Input Signal Twist Stop Stainless Steel Hardened Steel Spool Valve Gold-Plated Steel Zinc-Plated Steel Ball Bearing Stainless Steel Stainless Steel Feedback and Cam Springs Stainless Steel Shaft Snap...

Open the catalog to page 3

Posi-flate® is a registered trademark of Posi-flate, St. Paul, Minnesota. © 2013 Posi-flate • Printed in U.S.A. • Bulletin 21149 Corporate Headquarters Posi-flate • St. Paul, MN USA • +1 651 484 5800 Worldwide Offices Brazil • China • New Zealand • United Kingdom www.posiflate.com

Open the catalog to page 4

All Posi-flate catalogs and technical brochures

Archived catalogs

Trak-Lok® 449 Series Limit Switch and Position
4 Pages
Tork-Mate Pneumatic Actuator - Series 890
8 Pages