Hydraulic systems 1 part 2

Relief valves allow flow to bypass the system and return to the _____.

• A. Atmosphere

• B. Pump

• C. Actuator

• D. Reservoir

The primary purpose of a relief valve is to _____.

• A. Control flow

• B. Avoid pump reversal

• C. Limit system pressure

• D. Hold pump prime

A relief valve opens at _____ pressure.

• A. Full flow pressure

• B. Operating pressure

• C. Override pressure

• D. Cracking pressure

The advantage of a pilot-operated relief valve over a direct-acting relief valve is _____.

• A. Shorter pressure span

• B. Lower cost

• C. Less leakage

• D. Less parts

Check valves are used in hydraulics to _____.

• A. Control flow

• B. Control speed

• C. Block flow

• D. Control system pressure

Describe the function of the check valve indicated.

• A. To serve as a tank isolation valve

• B. To serve as an anti-cavitation check valve

• C. To provide meter in control

• D. To serve as a back-pressure check valve

The purpose of a pressure-reducing valve in a circuit is to _____.

• A. Provide for over-pressure protection

• B. Drop the pressure in a branch circuit

• C. Sequence cylinder action

• D. None of the above

A pressure reducing valve (PRV) is _____.

• A. A normally passing valve

• B. A device that senses downstream pressure

• C. Has a drain line connected to the reservoir

• D. All of the above

• E. Nome of the above

Tags

NGSS.HS-PS2-3

A check valve can be combined with a pressure-reducing valve in order to allow _____ flow.

• A. Direct

• B. Bypass

• C. Parallel

• D. All of the above

Because pressure is on the downstream side of a PRV, oil will naturally seep into the _____.

• A. Spring chamber

• B. Spool

• C. Reservoir

• D. Tank