Pneumatic Troubleshooting Mod 5- DCV & Flow Control Valves

An exhaust restrictor works by creating a ______________ in the system.

• Backpressure

• High DP

• Vacuum

• Low pressure area

The _______________ is used to control the pilot plunger’s movement in a pilot-operated DCV

• Piston

• Cushion

• Foam accumulator

• Solenoid coil

A DCV spool that will not return to its neutral position may be the result of a broken ____________________.

• Pilot plunger

• Return spring

• Rod cone

• Check valve

Air exhausting around the ______________ of a rotary actuator can be determined by feeling for the air leakage.

• Gasket

• Pilot plunger

• Spring

• Gland

If the ______________ of a quick exhaust valve does not seal properly, less air will be supplied to an actuator.

• Piston seal

• Rod seal

• Rod gland

• Diaphragm

A decrease in flow through a flow control valve can be caused by ____________.

• Worn check valve seat

• Worn checking element

• Blocked orifice

• Vibration

The ____________________ can be used to determine if a DCV’s spool is stuck or if the solenoid is not working.

• Manual overrides

• Flow meter

• Pressure gauge

• Valve offset

If the checking element in a flow control valve is stuck open, _____________.

• The flow through the valve will increase in the non-free flow direction

• The flow through the valve will increase in the free-flow direction

• No flow will pass through the valve

• The valve will chatter

An exhaust restrictor is used to control the speed of an actuator by controlling the rate that air is exhausted from the exhaust port of a ____________________.

• Flow control valve

• Quick exhaust valve

• DCV

• Cylinder

A ______________ solution can be used around the threads of an exhaust restrictor to check for leakage.

• Dykem

• Hydrocortisone

• Saline

• Soap