PC200_Manual_REV_G-1.pdf - 第52页

PC200 PVA Revis ion G (201 9) 52 of 56 Valve Drips For a Short Time After Shutoff • Air is trapped in the manifold • Air is trapped in the stat ic mixer • Bleed the valv e until the a ir is removed • Bleed the valve unt …

PC200

PVA

Revision G (2019)

51 of 56

Troubleshooting

Problem

Possible Cause Corrective Action

Valve Does Not

Cycle

• Air pressure to air section is too

low

• Stroke adjustment screw is

fully engaged

• Material is cured in the valve

• Valve was assembled without

lubricating the O-rings

• Increase the air pressure to 60-100

psi

• Turn stroke adjustment screw counter-

clockwise to increase snuff back

• Disassemble and clean valve

• Disassemble valve, lubricate O-

rings and assemble again

Material Leaks

From Static

Mixer

• Snuff back is set too low

• Lip seals are worn

• Air trapped in the valve or

static mixer

• Turn stroke adjustment screw counter-

clockwise to increase snuff back

• Replace lip seals

• Bleed valve until air is removed

Air Bubbles In

Fluid

• Valve is not correctly bled

• Problem with fluid delivery

system

• Bleed the valve until the air is

removed

• Diagnose and repair

No Flow From

Valve

• Manifold is blocked

• Air cylinder does not operate

• Static mixer is plugged

• Problem with material supply

• Examine and clean manifold

• Increase operating air pressure to 80

psi. Inspect valve for cured material

• Replace static mixer

• Examine material supply to the valve

Valve Drips

Continuously

After Shutoff

• Snuff back is set too low

• Lip seals are defective or worn

• Valve rods are defective or

worn

• Turn stroke adjustment screw

counterclockwise to increase snuff

back.

• Examine and replace lip seals

• Examine and replace valve rods

PC200

PVA

Revision G (2019)

52 of 56

Valve Drips For

a Short Time

After Shutoff

• Air is trapped in the manifold

• Air is trapped in the static mixer

• Bleed the valve until the air is

removed

• Bleed the valve until the air is

removed

Cross-

Contamination

In Manifold

Nozzle

• Snuff back is set too high

• System material supply not

correctly bled of air

• Turn stroke adjustment screw

clockwise to decrease snuff back

• Bleed material supply system until the

air is removed

Seals Fail

Rapidly

• Seals are not compatible with

material

• Material has abrasive fillers

• Contact PVA for seal options

Valve Has Air

Leak

• Jam nut is loose

• Air cylinder O-rings are worn

• Tighten jam nut against stroke

adjustment sealing washer

• Replace air cylinder section O-rings

Valve Leaks at

Separation

Block

• Lip seals are defective or worn

• Valve rods are defective or

worn

• Sleeve bearings are worn

• Examine and replace lip seals

• Examine and replace valve rods

• Examine and replace sleeve bearings

Material Does

Not Cure

• Mix ratio is incorrect

• Material not sufficiently mixed

• Do ratio checks at manifold and adjust

metering system as necessary

• Use a static mixer with sufficient

mixing elements – consult material

manufacturer or PVA

PC200

PVA

Revision G (2019)

53 of 56

Notes