Page 1: Table Of Contents
Instruction Manual the HPP-4 High Pressure Positioner Table of Contents Section Page Section Page Introduction Changing Positioner Action Description Scope of Manual Conversion to Split Range Technical Assistance Applications Assembly Procedures Separate Manual Guidelines for usage Inspection Procedures Technical Information...
Page 2: Introduction
Becker Preci- sion sales representative or Becker Description Precision technical assistance at: The Becker HPP-4 positioner is used in control valve assemblies with a control- Becker Precision Equipment, Inc. ler or I/P transducer and double acting...
Page 3: Applications
Retrofit Compatibility: Control Valves that require large volume Optimum performance is achieved by actuators may require Model VB-250 pairing the HPP-4 with genuine Becker Volume Boosters to ensure adequate control valve actuators. Should you al- stroking speed. Volume Boosters are...
Page 4: Technical Information
HPP-4 Positioner Specifications Technical Specifications Materials of Construction Standard: 3-15 psi or 6-30 psi. Input Signal: Anodized 2024 Aluminum External Parts: Adjustable: Zero is adjustable from 2- 30 psig, span is adjustable from 5-24 316 Stainless Steel and 2024 Ano-...
Page 5: Principals Of Operation
HPP-4 Positioner “How-It-Works” Power Gas and Cylinder Bottom Cylinder Top Exhaust Instrument Signal Principles of Operation Close on Increasing Signal The positioner is a force-balanced instrument that provides a control valve posi- tion proportional to the pneumatic input signal. The control valve will open on loss of input signal.
Page 6: Open On Increasing
HPP-4 Positioner “How-It-Works” Power Gas and Cylinder Bottom Cylinder Top Exhaust Instrument Signal Open on increasing Signal The positioner is a force-balanced instrument that provides a control valve posi- tion proportional to the pneumatic input signal. The control valve will close on loss of input signal.
Page 7: Adjustment Procedure
51-200 201-600 Important Note: For HPP-4 equipped with VB Series Volume Boosters, set variable orifices between 1 and 2 regardless of the cylinder size. Steady state gas consumption is minimized at 1. For additional information on VB Series Volume Boosters refer to Accessories section of this manual.
Page 8: Deadband Setting
– Step 5), place the its travel range. block valve in the closed position. 4. Apply power gas to the HPP-4 posi- tioner 7. Final Sensitivity Drum Adjustment Turn the Sensitivity Adjustment to set 5.
Page 9: Bias Adjustment
HPP-4 Positioner Bias Adjustment HPP-4 Discharge to PRESSURE SYS- Bias Adjustment TEM (EQUIPPED with Volume Boost- For Standard (Non-split range) Sys- ers) tems: + [0.2*(P (Equation 2.a) 1. To increase the bias setting, in- crease tension on the range spring.
Page 10: Range Adjustment
6-30 psi system. The limits of the range can be defined as the initial point at which the instrument signal Spring Range Stroke (Part Number) to the HPP-4 starts valve (psi) movement until the end of the valve stroke and full pressure differential across 01-6288 01-6287 01-6287 01-6801 the cylinder output gauges.
Page 11 HPP-4 Positioner Range Adjustment If the range is less than desired (i.e. the actuator reaches its full travel in less than the specified input range), strengthen the range spring by winding it counterclockwise onto the spring retainer. If the range is...
Page 12: Changing Positioner Action
(see piping schematic provided by Becker Precision Equipment) then To change open on increasing to close on reattached to the positioner. This will increasing: Part #25-1444 plus an Exten-...
Page 13: Conversion To Split Range
HPP-4 Positioner Split Range Stroke With Without 3. (Cont.) Reattach the mounting bracket upside down from its original 25-8265 25-8001 position. 25-8136 25-1093 4. Slide the thread spacer (brass bushing) over the adjusting screw 25-1402 25-1423 and tighten the washer and jam nut against the thread spacer.
Page 14 HPP-4 Positioner Maintenance and Inspection If the pressures do not respond in the Maintenance and Inspection correct direction when reversing the in- strument signal change, the unit has As with all precision equipment, it is internal friction. Disassemble the unit necessary to periodically test the posi- and replace all rubber goods.
Page 15: Inspection Procedures
Refer to original Becker invoice paperwork for proper power gas setting. 4. __________ Observe operation of gages and replace if defective. 5. __________ Check integrity of HPP-4 positioner seats. Varying input signal 1 psig should send one cylinder output gauge to full power gas.
Page 16: Parts Ordering
Parts List Parts Ordering The following is provided to allow the ordering of replacement parts. Please specify the Becker instrument serial number when ordering parts (this can be found on the Stainless Steel tab at- tached to the pilot by the 7/16 hex head cap screws. If the instrument was supplied as a com- plete valve regulator package, the Stainless tag attached to the actuator piston can also provide the serial number.
Page 17 HPP-4 Positioner Parts List HPP-4 September 1999...
Page 18: Open On Increasing (Parts)
HPP-4 Positioner Appendix HPP-4 September 1999...
Page 19 HPP-4 Positioner Appendix HPP-4 September 1999...

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