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Water leaks from the valve body or seat, or from the seat or nozzle body interface.
Streaming
This indicates the nozzle body gland is not tight. Turn off the high-pressure pump, and then tighten
the gland.
Shooting stream
This indicates there is a cracked valve body, seat, or nozzle body. You must replace the cracked
parts.
On/off valve does not open
If the on/off valve does not open, do the following:
◦ Make sure the shop air supply is on, correctly connected, and the pressure is 90–100 psig (6–7
bar) at the actuator. Check for kinks, breaks, and holes in the air line. Pull the line off the fitting,
and then manually turn the air on in FlowCUT to make sure that air is coming through.
◦ Make sure the controller signals the valve to open.
◦ Lack of high-pressure water can cause the on/off valve to not open. Make sure the pump is
running and if installed, all manual shut-off valves are open.
◦ Check for a blockage in the lines:
1. Turn off the pump, and if installed, close the manual shut-off valves.
2. Disconnect the high-pressure water line from the valve, aim it into the catcher tank, and
then secure it.
3. If installed, open the manual shut-off valves. Turn the pump on.
4. If there is a steady stream of high-pressure water going into the catcher tank, there is no
blockage. If the water stream is erratic, this indicates there is a blockage in the lines.
◦ Check for a failed actuator or valve seal. Keep the high-pressure water on and manually switch
the air on and off. If the fitting or cap on top of the actuator does not move up and down, there is
a problem with the actuator. Call Flow Service! If the fitting or cap does move up and down, but
the valve still does not open, it could be a failed valve seal. Replace the seal assembly.
On/off valve does not close
If the on/off valve does not close, do the following:
◦ Try manually switching the air on and off or disconnecting the air line to see if the valve will
close. There may be a problem with your software program or controller command to turn the air
off.
◦ Check for a failed valve seal. If the fitting or cap on the actuator moves up and down, but the
valve still does not open, it could be a failed valve seal. Replace the seal assembly.
© 2021 Flow International Corp.
Retrieved from Flow KB on April 19, 2021 PST
On/off valve repair
Summary of Contents for MACH 300
Page 1: ...MACH 300 SYSTEM MANUAL Includes Ancillary Options M 810 REV C en APRIL 2021...
Page 28: ...View 2 2021 Flow International Corp Retrieved from Flow KB on April 12 2021 PST Safety...
Page 29: ...View 3 2021 Flow International Corp Retrieved from Flow KB on April 12 2021 PST Safety...
Page 107: ...ANCILLARY OPTIONS For Mach 300...