IHP24
How does it work?
The IHP24 uses Solenoid Operated on/off Valves, SOV, to move the actuator to the requested set point. It has 4 or more outputs to control SOV’s depending on the model. The IHP24 is designed so it can use any solenoid valve on the market. The unit will automatically adapt the regulator to the performance of the complete system, during an automatic calibration. The desired position of the valve is sent to the IHP24 via the 4-20mA control loop or a communication protocol. The actual position is measured by the IHP via a potentiometer or a 4-20mA sensor. The set point and position signal is compared and the actuator is moved to the requested position.
See the schematic below for an example on how the IHP24 can be used with a standard regulator.
Communication
The IHP24 comes as standard with the following control and communication:
- 4-20mA Control loop with HART
- 4-20mA Position feedback
It is possible to add the following communication buses:
- Foundation Fieldbus
- Modbus
Power supply
The IHP24 is powered through a 24VDC power supply.
This power supply also feeds the solenoid valves and the sensors.
Position feedback
The IHP24 uses a signal from the actuator/cylinder to know where it is. The IHP24 accepts the following signal types:
- 4-20mA - 2-wire
- 4-20mA - 4-wire
- 3-wire potentiometer
Hydraulic system
All our typical designs control two (2) solenoid operated valves, but some of the IHP24 models can control up to 4 solenoid valves. The positioner is also easily adapted to any already existing control systems or other designs.
Spring return (SR) actuator control
Opening sequence
- The IHP24 receives a signal to open the valve.
- Both solenoids are energized.
- The ‘OPEN SOV’ directs hydraulic oil or air into the actuator chamber, compressing the spring. At the same time, the ‘CLOSE SOV’ blocks the fluid or air from exiting, ensuring pressure control.
- The pressure increases in the actuator chamber, and the valve opens.
Spring return (SR) actuator control
Closing sequence
- The IHP24 receives a signal to close the valve.
- Both solenoid valves are de-energized.
- The ‘OPEN SOV’ blocks hydraulic oil or air from entering the actuator chamber, while the ‘CLOSE SOV’ opens to release the
fluid or air from the chamber. - The pressure decreases, the spring pushes the actuator back – and the valve closes.
Spring return (SR) actuator control
Stay-put sequence
- The IHP24 receives a signal to hold the valve in the stay-put position.
- The ‘CLOSE SOV’ is energized.
- The ‘OPEN SOV’ blocks hydraulic oil or air from entering the actuator chamber, while the ‘CLOSE SOV’ simultaneously blocks it from leaving.
- With the chamber sealed, the valve remains in its current position – it stays put.
Double acting (DA) actuator control
Opening sequence
- The IHP24 receives a signal to open the valve.
- The ‘OPEN SOV’ is energized.
- The ‘OPEN SOV’ directs hydraulic oil or air into the actuator chamber, while the ‘CLOSE SOV’ releases the fluid or air from the opposite chamber.
- The actuator moves, and the valve opens.
Double acting (DA) actuator control
Closing sequence
- The IHP24 receives a signal to close the valve.
- The ‘CLOSE SOV’ is energized.
- The ‘CLOSE SOV’ directs hydraulic oil or air into the actuator chamber, while the ‘OPEN SOV’ releases the fluid or air from the opposite chamber.
- The actuator moves, and the valve closes.
Double acting (DA) actuator control
Stay-put sequence
- The IHP24 receives a signal to hold the valve in the stay-put position.
- Both solenoid valves (SOVs) are de-energized.
- With no flow in or out of the actuator chambers, the valve remains in its current position – it stays put.