Component Related Documentation
A shuttle valve is a control valve with two inlet ports and one outlet port. The higher of the two inlet pressures is delivered to the outlet port.
Safety Related Notes
Before working on this machine, perform lockout-tagout procedures per the rules of your plant. Determine the sources of energy on this machine – electrical, pneumatic and hydraulic – and release or vent sources of stored energy – electrical capacitors, air receivers, and hydraulic accumulators. Shut off sources of power – electrical, pneumatic and hydraulic. Safely block mechanical sources of energy such as loaded springs and loaded machine members, or safely position the machine members so they are unloaded and springs are not under tension. Beware of hot hydraulic fluid and hot surfaces which can cause burns. Never “crack a hydraulic or pneumatic fitting” to check for the presence of stored energy. Hydraulic fluid injection injuries, as well as injection injuries from many other fluids, are extremely serious and must be treated immediately by medical personnel familiar with this type of injury. Loss of body parts or death may result from improperly treated fluid injection injuries! Never use your hands to feel for a hydraulic leak! Review the schematics and think before proceeding to work on the machine to ensure you have made the machine safe to work on.
Troubleshooting Document
| Probable Cause | Possible Remedy |
|---|
| Broken spring |
- Disassemble and replace spring.
|
| Valve installed backwards |
- Reverse connection.
- Check free0flow direction indicator.
|
| No pump flow |
- See Troubleshooting Pump section.
|
| Poppet damage |
- Replace or refinish seat.
- Replace poppet.
- Check for excessive backpressure shock.
|
| Erosion |
- Drain, clean & flush system
- Refill system with filtered fluid
|
| Excessive leakage |
- Check leakage at cylinder at actuator of motor.
- See Troubleshooting Cylinder and Motors sections
|
| No or low pilot pressure |
- Check system pressure, increase as necessary.
- Check for collapsed pilot line.
|
| Leakage at plunger piston seal. |
- Disassemble and repair or replace
|
| Plunger piston binding |
- Disassemble and clean valve.
- Check for burrs on piston and/or bore.
|
| Incorrect valve size |
- Change valve
|
Item:
10.2
Description:
Valve, Shuttle
Manufacturer:
Sun
Part Number:
B008-179-B03
Stock Code:
.40074S
Electrical Address:
N/A
Component Application:
This shuttle valve is used to direct mooring control fluid to the control piston of the pump.
