Working Process Of Angle Seat Valve
An angle seat valve usually follows a simple operating sequence: a control signal starts the cycle, compressed air enters the actuator, the actuator moves the stem and plug, the valve opens for fluid flow, and a closing signal returns the valve to its closed position. This process repeats whenever the system requires another flow cycle.
Step-by-Step Operating Process
The working process can be divided into several stages:
- Control signal: The control system sends an opening command.
- Air entry: Compressed air enters the pneumatic actuator.
- Actuator movement: The piston moves inside the actuator.
- Stem movement: The piston transfers movement to the valve stem.
- Valve opening: The plug lifts away from the seat.
- Fluid flow: The process medium passes through the valve.
- Closing signal: The control system sends a closing command.
- Valve closure: The plug moves back against the seat.
Opening Process
When the opening signal arrives, compressed air enters the actuator chamber. The piston then moves and pushes the stem.
The stem lifts the plug from the seat, opening the flow passage. A pneumatic angle valve can complete this sequence without manual operation.
Fluid Transfer Stage
After opening, the process medium enters through the inlet and passes through the angled valve body.
During this stage, the angle seat valve remains in its commanded position until the control system sends a closing signal.
Closing Process
When the process requires flow to stop, the control system removes or changes the pneumatic signal.
The actuator then moves the stem in the closing direction. The plug returns to the seat and blocks the flow passage.
Single-Acting Return Process
For a single-acting design, the closing or opening return may depend on a spring. The sequence normally includes:
- Pneumatic pressure moves the actuator.
- The valve reaches the commanded position.
- Air pressure is removed.
- Spring force returns the actuator.
- The plug returns to the designated position.
Double-Acting Process
A double-acting seat valve uses compressed air for both directions.
- Air enters the opening chamber.
- The actuator moves the stem.
- The valve opens and fluid flows.
- The air signal changes.
- Air enters the closing chamber.
- The actuator moves back.
- The valve closes.
Y-Type Angle Valve Process
A y type angle valve follows the same basic control sequence but uses a different body and flow arrangement.
For filling equipment, the process can be:
Start signal → actuator movement → valve opening → fluid filling → stop signal → valve closing.
This arrangement is used where controlled filling and repeatable valve movement are required.
Typical Operating Conditions
| Parameter | Typical Specification |
|---|---|
| Body material | SS304 / SS316L |
| Seal material | PTFE |
| Working pressure | Up to 16 bar |
| Temperature | -10°C to +180°C* |
| Operation | Pneumatic |
| Actuation | Single / Double acting |
| Connection | Thread / Clamp / Weld / Flange |
| Medium | Air / Water / Neutral gas |
*Actual limits depend on the valve configuration and sealing material.
Complete Working Cycle
The complete process of an angle seat valve can be summarized as:
1. Command → 2. Air supply → 3. Actuator movement → 4. Stem movement → 5. Valve opening → 6. Fluid flow → 7. Closing command → 8. Valve closure
The same cycle can repeat continuously in automated equipment. The main differences between valve types come from the actuator arrangement, return method, and body configuration.
