Flowserve XL90 Series Manual do Utilizador descarregar pdf

GENERAL INFORMATION

This bulletin is designed to assist in installing, calibrating,

troubleshooting and performing maintenance as required for the

XL90 Series high-performance positioner.

Product users and maintenance personnel should thoroughly

read and strictly follow the instructions contained in this bulletin

prior to operating the positioner. Any questions concerning this

product should be directed to a Flowserve representative.

To avoid possible injury to personnel or damage to valve

parts, WARNING and CAUTION notes must be strictly

followed. Modifying this product, substituting non-

factory parts or using maintenance procedures other

than outlined could drastically affect performance and be

hazardous to personnel and equipment.

The XL90 high-performance positioner is a two-stage device

and is designed for use in control loops where fast response is

required. The XL90 positioner is designed to be modular and use

the P/P module for 3-15 psi input signal or the NT 3000 Series

Transducer Module for 4-20 mA input signal.

The XL90 high-performance positioner is designed as a four-

way device, but can easily be converted to a three-way device by

plugging one of the output ports.

NOTE: The XL90 high-performance positioner must use the

I/P NT 3000 Transducer. The I/P 2000 Transducer is not

acceptable for use with the XL90 Series Positioner.

The XL90 positioner can handle supply pressures up to 150 psi;

thus, a supply regulator is usually not required. However, a five

micron air filter is required for pneumatic positioners and a

coalescing filter is required for I/P positioners.

NOTE: The air supply should conform to ISA Standard S7.3 (a

dew point at least 18° F / -8° C below ambient temperature,

particle size below 5 microns, oil content not to exceed one

part per million).

The XL90 Series positioner features an adjustable gain of

400-1100:1. The medium gain setting is standard for smaller

actuators, while the high gain setting is used on larger actuators

(refer to ‘Gain Adjustment Procedure’ section for further details.)

POSITIONER OPERATION

The positioner schematic (Figure 1) shows an XL90 Series

positioner connected for double-acting service on a rotary rack-

and-pinion actuator. Tension on the feedback spring provides

feedback to the positioner, which varies as the stem position

changes. The spring-loading force is applied through the feed-

back linkage and cam to the positioner’s input capsule.

Instrument signal pressure is applied between the diaphragms in

the input capsule. Therefore, the input capsule serves as a force-

balance member, matching the valve stem position (as measured

by tension on the feedback spring) to the instrument signal.

When the opposing forces balance exactly, the system will be

in equilibrium and the stem will be in the exact position called

for by the instrument signal. If the opposing forces are not in

balance, the input capsule will move up or down and, by means

of the pilot-valves, will change the output pressures, moving the

stem until the tension on the feedback spring exactly opposes

the instrument signal pressure.

The sequence of operation is as follows: An increase in instru-

ment signal pressure forces the input capsule downward.

Displacement of the capsule in turn moves the flapper away

from the detecting nozzle. This allows a larger flow rate through

the nozzle, decreasing the pressure exerted on the top of the

pilot valve capsule.

VLAIM 048-00 (181157.000.000) Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 48-1

Flow Control

Installation, Operation, Maintenance Instructions

XL90 Series

High-Performance

Positioner

1 2 3 4 5 6 ... 15 16

Resumo do Conteúdo

Página 1 - Positioner

GENERAL INFORMATIONThis bulletin is designed to assist in installing, calibrating,troubleshooting and performing maintenance as required for theXL90 S

Página 2

1 Base assembly2 Cover3 Screw6 Pressure gauge 0-160 psi7 Bottom relay assembly8 O-ring9 Upper relay assembly10 Orifice screw11 O-ring12 O-ring13 Relay

Página 3

1 Base assembly2 Cover3 Screw6 Pressure gauge 0-160 psi7 Bottom relay assembly8 O-ring9 Upper relay assembly10 Orifice screw11 O-ring12 O-ring13 Relay

Página 4 - Positioner Balance Adjustment

XL90 Part Numbering SystemPREFIXSelection CodeAutomax Manufacture - Black Epoxy MBAutomax Manufacture - White Food Grade Epoxy MWAccord Manufacture -

Página 5 - Gain Adjustment Procedure

General Spare Parts KitsStandard O-ring Kit – Part No. 10094526Item No. Description Quantity8 Relay/base O-ring and relay tube O-ring 611 Orifice scre

Página 6 - FLOWSERVE

48-14 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611Shaft Kit, NAMUR End Connection – Part No. 10118753Item No. Description Qua

Página 7 - Positioner Maintenance

Transmitter Kit, 4-20mA Output, NAMUR Shaft EndConnection – Part No. 10118427Item No. Description Quantity52 Cam Shaft 1112 Retaining Ring 2128 Jam Nu

Página 8 - XL90 OPTIONS

48-16 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611Intrinsically Safe Proximity Limit Switch Kit, NAMUR ShaftEnd Connection –

Página 9

Supply air biases the pilot-valve in an upward direction. Asthe capsule moves up, it will close the exhaust seat of the upperpilot poppet and open the

Página 10

Mounting Instructions for XL90 with NAMUR ShaftConnection1. Mount the bracket to the actuator. Finger tighten thebracket bolting. 2. If required, inst

Página 11

3. Place cam over the shaft with the appropriate characteristicfacing up and closest to the span arm roller. For Seregcams, see Table I. For Accord ca

Página 12 - XL90 Part Numbering System

4. Remove rubber cap over balance adjustment screw. (SeeFigure 6.)5. Apply full actuator operating pressure to positioner supplyport.6. Set input sign

Página 13 - General Spare Parts Kits

WARNING: Be certain power to I/P module is disconnectedbefore removing housing cover in explosive atmospheres;otherwise personal injury may occur.3. B

Página 14 - Electronic Spare Parts Kits

2. Remove the I/P module housing cover.WARNING: Be certain power to the I/P module is discon-nected before removing the housing cover in explosiveatmo

Página 15

adjustable gain lower plate (26), and diaphragm plate.Remove signal diaphragm assembly (15) and remove relayplate (14) from between the diaphragms. Pl

Página 16

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 48-9Failure Probable Cause Corrective ActionValve won’t 1. Tubing to wrong port