Flowserve Valtek VL Spring Cylinder Linear Actuators Bedienungsanleitung PDF herunterladen (Seite 6)

Valtek Spring Cylinder Linear Actuators FCD VLENIM002-00-AQ 10/14

NOTE: Item numbers correspond directly to actuator’s bill of material. Refer to it for speciﬁc part numbers.

Figure 4: Cap-spring Cylinder Actuator

Adjusting Screw

(Item No. 210)

Spring Cap

(Item No. 325)

Spring

(Item No. 229)

Cylinder

(Item No. 202)

Spring Guide

(Item No. 326)

Piston O-ring

(Item No. 271)

Yoke O-ring

(Item No. 274)

Cylinder Retaining Ring

(Item No. 256)

Actuator Stem

(Item No. 211)

Stem Bellows

(Item No. 247)

Stroke Plate

(Item No. 213)

Yoke

(Item No. 201)

Adjusting Screw Gasket

(Item No. 248 )

Spring Button

(Item No. 227 )

Cap O-ring

(Item No. 270 )

Actuator Stem Locknut

(Item No. 348 )

Piston Stem O-ring

(Item No. 272 )

Piston

(Item No. 225 )

Upper Stem Bushing

(Item No. 253 )

Actuator Stem O-ring

(Item No. 275 )

Lower Stem Bushing

(Item No. 254 )

Stem Clamp Bolting

(Item No. 240/345 )

Stem Clamp

(Item No. 249 )

Problem Probable Cause Corrective Action

High air consumption or leakage

Leaks in the air supply or instrument signal

system

Tighten connections and replace any leaking lines

Malfunctioning positioner Refer to appropriate positioner maintenance bulletin

Leaks through O-rings or adjusting screw gasket Replace O-rings or gasket

Actuator does not move to fail

position upon loss of air supply

pressure

Air pressure in cylinder not venting because of

faulty positioner

Refer to appropriate positioner maintenance bulletin

Spring failure Replace spring

Internal valve problem Refer to valve’s maintenance bulletin

Jerky or sticking stem travel

Insufﬁcient air supply pressure Check air supply and any ﬁlters or regulators; check for

leaking O-rings

Unlubricated cylinder wall Lubricate cylinder wall with silicone lubricant

Worn or damaged stem bushings Check actuator stem for damage; replace actuator stem,

O-ring, and stem bushings, if necessary

Improperly assembled spring Disassemble actuator and check cylinder and piston for

damage; reassemble actuator correctly

Internal valve problem Refer to valve’s maintenance instructions

Troubleshooting

1 2 3 4 5 6 7 8

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Flowserve Valtek VL Spring Cylinder Linear Actuators Bedienungsanleitung Seite 6

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