How do two solenoids control a cylinder?
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As shown in the figure, it is controlled by two solenoid valves; is interlock control required for this overall setup? Do we still need redundancy? ? ?
1. The filtering pressure reducer goes through a tee: one path leads to the air control valve, and the other path leads to the two solenoid valves. 2. This is a redundancy measure for solenoid valves; if both solenoid valves lose power, the pneumatically controlled valve will release air, causing the valve to assume a faulty position
1. The two solenoids are connected in series, intended for interlock control. I have encountered this situation before: when both the DCS and SIS needed to interlock to shut off this valve, two solenoids were installed, with the solenoid located near the cylinder being controlled by the SIS. 2. The two solenoids are connected in parallel, presumably to serve as a redundancy mechanism; when one solenoid fails and loses power, the other can still function.
The solenoid valves are configured in a redundant manner, so that the failure of any single solenoid valve does not affect the normal operation of the valve. The atmospheric pressure tank is equipped with two ASCO stainless steel solenoid valves – a company that isn’t skimping on costs!
The solenoid valves are configured in a redundant manner, so that the failure of any single solenoid valve does not affect the normal operation of the valve. The atmospheric pressure tank is equipped with two ASCO stainless steel solenoid valves – a company that isn’t skimping on costs!
Who can explain in detail how this valve works?
It should be a double-acting control valve with a positioner
It must be a single-acting cylinder without a positioner, because the accessories include only SMC’s filter pressure regulator, ASCO’s 8327 series solenoid valves, and that switch on top is probably from ToPworx. To determine whether it is a single-acting or double-acting actuator, one usually looks at its size – those that are longer are generally single-acting, as they contain springs inside, while double-acting cylinders are shorter in length