Explain with neat sketch, symbol & working of time delay valve.

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written 6.9 years ago by

teamques10 ★ 70k

• modified 6.9 years ago

Time delay valve is a combination valve used to set the operation time as per the requirement.
The time delay can be increased or decreased by adjusting the flow through the non-return flow control valve. - The change invariably increases or decreases the time taken to fill and pilot actuates the direction control valve.
Time delay valve is a combination of a pneumatically actuated 3/2direction control valve, an air reservoir and a throttle relief valve. The time delay function is obtained by controlling the air flow rate to or from the reservoir by using the throttle valve.
Adjustment of throttle valve permits fine control of time delay between minimum and maximum times. In pneumatic time delay valves, typical time delays in the range 5-30 seconds are possible.The time delay can be extended with the addition of external reservoir.Time delay valve, NC type.
The constructions of an on-delay timer (NC) type in the normal and actuated are shown in Figure It can be seen that 3/2 DCV operates in the on delay mode permanently. But, in some designs, the valve can be operated in the off-delay mode by connecting the check valve in reverse direction.

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