Flowserve Valtek FlowTop General Service Control Valve Instrukcja Użytkownika Pobierz pdf (Strona 15)

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 60-15

Troubleshooting FlowTop Control Valves

Problem Probable Cause Corrective Action

Stem motion 1. Overtightened packing 1. Adjust packing box nuts to slightly over finger-tight

impeded 2. Service temperature is beyond 2. Reconfirm service conditions and contact factory

operating limits of trim design

3. Inadequate air supply 3. Check for leaks in air supply or instrument signal

system; tighten loose connections and replace

leaky lines, verify spring set values

Excessive 1. Malfunctioning positioner 1. Refer to positioner maintenance instruction manual

leakage 2. Improperly tightened bonnet 2. Refer to

Preventive Maintenance

and Table II

flange bolting section for correct tightening procedure

3. Worn or damaged seat ring 3. Disassemble valve and replace or repair seat ring,

follow proceedure in

Replacing Plug and Seat

4. Inadequate actuator thrust 4. Check for adequate air supply to actuator; verify

spring set values; if air supply is adequate,

reconfirm service conditions and contact factory

5. Incorrectly adjusted plug 5. Refer to

Stroke Length Adjustment

for correct plug

adjustment

6. Incorrectly adjusted zero 6. Recalibrate positioner (see Step 1)

adjustment locknut

7. Improper handwheel adjustment 7. Adjust handwheel until plug seats properly

acting as a limitstop

Inadequate 1. Improper plug adjustment, 1. Refer to

Stroke Length Adjustment

for correct

flow limiting stroke plug adjustment

2. Malfunctioning positioner 2. Refer to positioner maintenance IOM

3. Service conditions exceed trim 3. Verify service conditions and consult factory

design capacity

4. Insufficient air supply pressure 4. Verify air supply requirements, spring set values

Plug slams 1. Incorrect flow direction 1. Install valve in flow-under direction

Valve does 1. Incorrect flow direction 1. Reconfirm direction and, if necessary, correct flow

not fail in direction through valve

correct 2. Wrong failure direction 2. Reverse spring failure direction on actuator; refer

position to

Reversing the Actuator Action

Air Supply Connection

For actuators without positioners, control air is con-

nected directly to the air supply port of the appropriate

actuator housing: for direct-acting actuators (air-to-

close / fail-open) to the upper housing and for reverse-

acting actuators (air-to-open / fail-close) to the lower

actuator housing. The air connections for tandem ac-

tuators are illustrated in Figure 12.

For actuators with positioners, the air piping is factory

installed depending on the required action direction. In

the field, only the air supply needs to be connected to

the positioner or to the air filter regulator.

The threads of the actuator supply ports are 0.25-inch

NPT. Other air connections are available on request.

IM049 FlowTop IOM.p65 2/10/03, 12:34 PM15

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Flowserve Valtek FlowTop General Service Control Valve Instrukcja Użytkownika Strona 15

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