Handwheel
Handwheel. If the supply pressure falls to 75% of the normal pressure, the trip valve will react to this as a reduction in the system air supply, whereupon it will move to the right and open the connection between the air tank and the top or bottom cylinder connection depending upon the method of connection. A double acting piston configured to lockup A three way switching valve or regulator actuates both trip valves to lockup a cylinder when normal air supplies fail. The fact that the valve plug strokes at 75% of the normal working pressure depends upon the ratio of areas in the trip valve.
When the system again returns to normal air pressure, both the lockup and fail-safe systems return to their positions for normal operation. If the handwheel must continue to be operated, or if the valve has to be controlled while these systems are engaged, then it is necessary to fit a small needle valve to balance the pressure in each of the lockup valves and to vent the pressure in the fail-safe valve. The needle valve must be closed again before returning to normal operation.
Bosstoto
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Gallery of Handwheel
