Valtek Flow Boosters.pdf - PRO-QUIP

More documents

Recommendations

Info

Housing Bolt(Item No. 12)Housing Cover(Item No. 2)Upper Spring(Item No. 17)Bypass Valve O-ring(Item No. 14)Bypass Valve(Item No. 9)Spring Cap(Item No. 18)Bypass Valve Nut(Item No. 13)Upper Diaphragm(Item No. 8)Vent Ring(Item No. 3)Lower DiaphragmAssembly(Item No. 7)Housing(Item No. 1)Lower Spring(Item No. 11)End Plug(Item No. 10)Poppet(Item No. 4)Lower Spring Cap(Item No. 21)End Plug O-ring(Item No. 15)Figure 4: Flow Booster – Exploded ViewE011234-6
Flow Booster TroubleshootingProblem Probable Cause Corrective ActionValve overshoots 1. Bypass porting is too restrictive 1. Turn the bypass valve counterclockwiseuntil overshoot is corrected2. Diaphragm not aligned 2. Disassemble the flow booster and alignproperly over bypass porting both diaphragms over their appropriateholes3. Obstruction in the bypass 3. Disassemble the flow booster andportingclean out the portingValve is over-damped 1. Bypass porting is not restrictive 1. Turn the bypass valve clockwise untilenoughover-damping is corrected2. Diaphragms are damaged and 2. Replace the diaphragmsleakingLoss of sensitivity 1. Spring caps not sliding properly 1. Apply an anti-seize lubricant to thesurface of the spring bore2. Obstruction in the signal port 2. Remove obstruction in signal portBooster continuously 1. Bypass needle valve is closed 1. Adjust bypass valve (see “AdjustingexhaustingFlow Booster Operation” section.)2. Lower diaphragm is leaking air 2a. Disassemble flow booster and pressdown on retaining ring or replaceretaining ring2b. Replace the lower diaphragm3. Poppet seating surfaces are 3a. Replace the poppet valve and cleandamagedout obstructions that may havecaused the damage3b. Replace booster body or upperdiaphram assembly if their seats aredamaged4. Positioner pressure imbalance 4. Refer to the appropriate positionerproblemmaintenance instructions5. Aluminum seat/upper poppet 5a. Replace the retaining ring under thevalve not sealinglower diaphragm5b. Align the lower diaphragm with thehousing bolt holes6. Actuator is leaking air 6. Repair actuator as neededExcessive air 1. Air leakage over or under the 1a. Tighten the six capscrews evenlyconsumption diaphragms 1b. Clean the diaphragm surfaces1c. Replace the diaphragm(s)2. Air leakage past the bypass 2. Replace the O-ring on the bypassvalvevalve and lubricate the O-ring3. Air leakage past the end plug 3a. Tighten the end plug3b. Replace or straighten the O-ring4. Air leakage at NPT connections 4a. Tighten connections4b. Apply sealing compound/tape34-7
Page 1 and 2: Valtek Flow BoostersGENERAL INFORMA
Page 3 and 4: CAUTION: Cycling the control valve
Page 5: Flow BoosterOutput 2(plugged)Output

Valtek Flow Boosters.pdf - PRO-QUIP

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?