A Direct Acting (DA) pneumatic thermostat increases branch line pressure as temperature increases. A Reverse Acting (RA) pneumatic thermostat decreases branch line pressure as temperature increases.
When actuator travels in the direction of air supplied, then the actuator is called direct acting actuator.
When a pressure signal is applied, the valve shaft moves in the direction opposite that of the direct-acting actuator, but it follows the same operating principle. In the reverse-acting actuator, the valve shaft is pulled into the actuator by the application of a pressure control signal.
A reverse acting thermostat works by opening the contacts within the thermostat when the temperature rises above the set point. This action breaks the circuit, turning off the heating or cooling system. Essentially, it operates opposite to a direct acting thermostat, which closes the contacts to turn on the system when the temperature falls below the set point.
Both have a force acting to bring the spring back to its original length. So the 1/2kx2 is just in the reverse direction (not because the x is negative because the acting force is towards x0, the original length).
The expression for equilibrium is when the rate of the forward reaction is equal to the rate of the reverse reaction and the concentrations of reactants and products remain constant over time. Mathematically, it can be represented as: [ \text{rate}{\text{forward}} = \text{rate}{\text{reverse}} ]
acting, is acting, I am acting, he/she is acting, they are acting
good acting and bad acting
acting head
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Impromptu acting is acting at the spur of the moment.
if several COPLANAR FORCES are acting at a point simultaneously such that each one of them can be represented in direction and magnitude by a side of a polygon, taken in order, then the resultant is given by the closing side in the reverse order