What Is a Plate Cam?

Cam operated valve is a cam operated valve.

Kind of driven rotating parts and

Cam-operated valves are also known as variable valve timing systems. High Performance Today

the term	Explanation	the term	Explanation
Control valve	General term for valves that change the flow state and control the pressure or flow	Solenoid operated valve	Solenoid operated valve
Pressure control valve	Generic term for valves that control pressure	Manually operated valve	With manually operated valve
Flow control valve	Generic name for valves that control flow	Cam operated valve	Cam-operated valve
Directional control valve	Generic term for valves that control the direction of flow	Pilot valve	Auxiliary valves used to operate control mechanisms in other valves or components
Sequence valve	In a system with two or more branch circuits, a valve that controls the sequence of operation of the actuator according to the pressure of the circuit, etc.	Hydraulic directional valve	Directional valve operated with pilot fluid pressure
Balancing valve	Pressure control valve to maintain back pressure to prevent load drop	Pilot operated check valve	A valve that allows a non-return valve to flow by controlling the pressure of the fluid
Pressure reducing valve	The outlet pressure of this pressure control valve can be adjusted to a value lower than the inlet pressure, this value has nothing to do with the flow rate and the inlet side pressure	Two-position valve	Reversing valve with two valve positions
Unloading valve	Valve capable of unloading hydraulic pump under certain conditions	Electro-hydraulic directional valve	Hydraulic directional valve combined with electromagnetically operated pilot valve
Throttle	A valve that uses a throttling action to limit the flow of liquid. Usually refers to a flow valve without pressure compensation	Valve position	The position used to determine the flow state in the reversing valve
Control Valve	Flow control valve that is independent of back pressure or pressure change due to load and can maintain the flow set value	Normal position	Valve position when no operating force is applied
Speed compensation valve with temperature compensation	Speed regulating valve that can be independent of liquid temperature and can maintain flow setpoint	Neutral position	Determined central position of the reversing valve
Diverter valve	When diverting fluid to more than two hydraulic pipelines, the application of this valve allows the flow to be split in a certain proportion, regardless of the pressure in each pipeline.	Offset position	All valve positions except the neutral position in the reversing valve
Directional valve	Directional control valve with two or more flow patterns and two or more ports	Locked position	Valve position of the directional valve held by the locking device
Cover (or overlap)	The overlap between the valve spool shoulder portion and the window portion of the spool valve, the value is called the covering amount	Three-position valve	Reversing valve with three valve positions
Relief valve	When the pressure of the circuit reaches the set value of such a valve, a part or all of the fluid flows back to the tank through this valve, so that the pressure of the circuit is maintained at the set value of the valve	Two-way valve	Control valve with two ports
Safety valve	Valve to limit the highest pressure in the circuit to prevent damage to components, pipes, etc.	Four-way valve	Control valve with four ports
Zero cover	When the spool of the spool valve is in the neutral position, the window is completely closed, and when the spool is slightly displaced, the window opens and the liquid can pass through.	Spring return valve	Valve returned to normal position by spring force
Covering	When the spool of the spool valve is in the neutral position, there must be a certain amount of displacement (not large) before the window can be opened	Median closed	All ports are closed when the directional valve is in the neutral position
Negative cover	When the spool of the spool valve is in the neutral position, there is already a certain amount of opening	Median open	All ports are connected when the selector valve is in the neutral position
servo valve	Control flow or pressure as a function of an electrical signal (or other input signal)	Normally open	The pressure port is connected to the oil outlet in the normal position
Spool valve (or spool valve)	Valve with cylindrical spool valve	Normally closed	Pressure port is closed in normal position
Shuttle valve	Valve with one outlet and two or more inlets, the outlet having the function of selecting the inlet with the highest pressure	Spring centering valve	Three-position directional valve with normal position in neutral position, which belongs to a type of spring return valve
The electromagnetic valve	This is the collective name of solenoid operated valve and solenoid piloted directional valve.	Spring biased valve	Reversing valve whose normal position is offset position belongs to a type of spring return valve
Check valve	The fluid can only flow in one direction and cannot pass in the other direction	Number of ports	Number of ports connected to the valve
Throttle Reversing Valve	Reversing valve whose flow rate can be continuously changed according to the operating position of the valve	Shoulder section	Sliding surface of spool when moving

Inspection of valve body and actuator

1. Check for air leakage in the air source, signal pipeline, diaphragm, etc.

2. Check for air leakage at each seal.

3. Check the valve stem and bushing for cracks and scars.

4. Check whether the valve stem moves in a timely, stable and noise-free manner.

5. Check the tightness of flanges and gaskets, and tighten all flanges and gaskets at least once a year.

6. Check the lubrication and add lubricant if necessary.

7. Check the tightness of the stuffing cover, do not be too tight or too loose, the standard is to tighten a little tighter with bare hands.

Valve positioner

1. Check the base and shell for dirt.

2. Check whether the input and output signals are normal.

3. Check the amplifier for damage and deformation.

4. Check the cam part for damage and deformation.

5, check the gear part for damage and deformation.

6. Check the feedback circuit for wear and damage.

Decompression filter

1. Open the drain valve and deflate manually to see if any liquid remains.

2. Check whether the set pressure is normal.

3. Regularly inspect each part for wear. The inspection period is usually one year.

maintenance

1. Normally, lubricating oil is added to the valve once a year, and the frequently operated valve can be determined according to actual application.

2. For infrequently used valves, the following steps should be taken when deactivating:

(1) Close the air source input manual valve of the valve positioner to deflate the pressure reducing valve.

(2) Cut off the signal input of the valve positioner.

(3) Butter the exposed part of the valve stem to prevent dust and rust.

(4) Manually degas the pressure reducing valve and apply lubricating oil, so that it can be easily opened when re-used.

(5) A protective cover should be added to the valve in the wind season or winter to prevent dust and sea wind erosion.

3. For valves that are not frequently used, the following steps should be performed when reusing:

(1) Check the lubrication of the valve and re-lubricate if necessary.

(2) Before being put into use, the valve stem should be moved back and forth for several strokes to check whether the movement is flexible and stable.

(3) Observe the input signal of the valve and the reading of the stroke scale. If the percentage of the input signal differs from the percentage of valve opening by more than 5%, it should be re-calibrated before use. ^[3]