When do you open the bypass control valve?
The duty of the bypass system calls for an immediate opening of the bypass control valves in the case of a partial- or full-load rejection. They open the bypass valves to the same position the turbine control valves were in before being closed because of unacceptable conditions.
How is the spool of a valve moved?
Spool can be moved in many different ways it can be done manually. The energy sources and components are connected to a spool valve by ports and they are the chambers drilled through the outer casing of the valve. Spool valves can be operated in many ways like by using a button, lever, or by a solenoid.
How can you bypass a proportioning valve in a car?
Perform the same brake fluid bleed on the rest of the wheels, continuing next with the left rear wheel, until all air is removed. Fill your master cylinder with brake fluid. Bleed the right front bleeder valve, then bleed the left front bleeder valve last. Ask the assistant if the dash light has gone out.
Can a rotary spool valve be mounted on a manifold?
Rotary spool valves are frequently manufactured as ‘screw-in cartridge’ valves which enables them to be either incorporated into manifold blocks along with other control valves or mounted in their own individual body.
What happens when a valve spool fails to move?
VALVE SPOOL FAILS TO MOVE 1. Dirt in system 2. Blocked drain 3. Pilot pressure off 4. Solenoids inoperative 5. Distortion 6. Improper re-assembly after overhaul 1. Disassemble, clean, and flush. 2. Inspect for plugs or foreign matter. 3. Check source of pilot pressure. 4. Check electrical source and solenoid fields. 5.
How are the ports on a spool valve operated?
A spool valve can be operated in a number of ways; we could use: – Button – Lever – Solenoid. Spool valves are usually referred to by the nomenclature 3/2 or 5/3 etc., where the first number relates to the number of ports and the second to the number of different spool positions.
What to do if your proportioning valve goes out?
If the brake pedal does not move downward, have your assistant stomp on the brake pedal with medium to hard pressure, and hold it down firmly. If you hear a click from the valve, and your assistant tells you the dash light has gone out, stop and close the valve. The interior spool device inside the proportioning valve has moved and centered.
What do you call a pneumatic spool valve?
Spool valves are usually referred to by the nomenclature 3/2 or 5/3 etc., where the first number relates to the number of ports and the second to the number of different spool positions. We hope you enjoyed this short introduction to pneumatic and hydraulic spool valves.