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Hydraulic Symbols HYS102 Part D Pressure Control Valves PowerPoint PPT Presentation


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Advance Search Forward & Reverse. Beginner’s Series. {sounds of throat clearing}. Hydraulic Symbols HYS102 Part D Pressure Control Valves. Please advance each slide at the tone. 1. Each member of the pressure control family starts with a square.

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Hydraulic Symbols HYS102 Part D Pressure Control Valves

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Hydraulic symbols hys102 part d pressure control valves

Advance Search Forward & Reverse

Beginner’s Series

{sounds of throat clearing}

Hydraulic Symbols

HYS102

Part D

Pressure Control Valves

Please advance each slide at the tone.


Hydraulic symbols hys102 part d pressure control valves

1. Each member of the pressure control family starts with a square

4. Add a dashed line from the inlet port to the top of the valve

2. Yes, good job. The 2 little lines are the ports

5. Add a spring, and while you’re on a roll, put an arrow thru the spring at a 450 angle

3. Add an arrow to indicate the flow path thru the valve


Hydraulic symbols hys102 part d pressure control valves

1. Excellent! We have a relief valve

5. Until pilot pressure in the dashed line is high enough to overcome the spring force

2. The flow path arrow is not in alignment with the ports

  • Which means the valve is normally closed

6. Yon 450 arrow means that the spring, and thereby, the pressure setting of the valve, is adjustable

4. The spring holds the valve closed


Hydraulic symbols hys102 part d pressure control valves

What have we learned so far?

1. A relief is one member of the pressure control family

2. The valve is held in its normally closed state by the spring until the pilot pressure exceeds the spring setting

3. The arrow thru the spring shows that the spring is adjustable


Hydraulic symbols hys102 part d pressure control valves

1. A sequence valve symbol is the same as a relief with the addition of an external drain

2. Typically, a sequence valve is used to cause one cylinder or motor to start moving before another cylinder or motor

Sequence Valve


Hydraulic symbols hys102 part d pressure control valves

1. the counterbalance valve symbol is the same as a relief

2. Typically, a counterbalance valve is used to hold a load from falling

Counterbalance Valve


Hydraulic symbols hys102 part d pressure control valves

What have we learned so far?

4. A Sequence valve has an external drain

5. A counterbalance valve symbol is the same as a relief valve


Hydraulic symbols hys102 part d pressure control valves

External pilot

Internal pilot

1. A brake valve symbol is the same as a relief and includes an external pilot line in addition to the internal pilot line

2. Typically, a brake valve is used to brake the speed of a freewheeling hydraulic motor

Brake Valve


Hydraulic symbols hys102 part d pressure control valves

External pilot

1. An unloading valve symbol is the same as a relief, but it has external pilot

2. Typically, an unloading valve is used to unload a pump at low pressure

Unloading Valve


Hydraulic symbols hys102 part d pressure control valves

5. This valve, as well as most of the others, comes with an optional check valve

Normally open

1. The pressure reducing valve is the only normally open pressure control

2. Typically, it’s used to reduce the pressure in a portion of the system

4. You know an external drain when you see one

3. It has internal pilot, but this silly thing has it coming from the outlet port

Pressure Reducing Valve


Hydraulic symbols hys102 part d pressure control valves

What else have we learned?

6. A brake valve has both internal and external pilot lines

7. An unloading valve is like a relief except it has an external pilot line

  • A pressure reducing valve is wierd

  • the only Normally open pressure control

  • Pilot pressure sensed from the outlet port


Hydraulic symbols hys102 part d pressure control valves

Thanks for hanging with me

Wanna hook all of these valves up? There’s hands-on training in Birmingham

Close this window and click on the final module, then you’re done


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