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Modeling a valve actuator with a support requires a different modeling approach. Instead of specifying "Yes" to Operator/Actuator in the Define>Components>Valve dialogue and then entering weight and offsets, instead leave the Operator/Actuator field "No". We will use Draw joint to draw a joint/point offset from the valve to the CG location of the actuator/operator, connect the joint to the valve using a body constraint, assign (zero weight rigid connection), assign a -Z downward point load on that joint for the actuator weight, then draw, insert, or assign a pipe support to the newly drawn joint. If you're connecting to the valve midpoint, you will need to draw a joint at the valve midpoint.
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