Force - A push or pull acting upon a body. In a hydraulic cylinder, it is the product of the pressure on the fluid, multiplied by the effective area of the cylinder piston. It is measured in pounds or tons. Friction - The resistance to fluid flow in a hy- draulic system.
temperature increase The pressure of a contained sample of gas can be increased by increasing its temperature, or by decreasing its volume, or by injecting additional mas â¦ s into it.
Which way do you turn the bolt on the water pressure valve to increase the pressure?   On your Pressure Reducing Valve(PRV), you would undo the nut and turn the bolt clockwise(or turning it into the PRV)to increase the volume and pressure. 17 people found this useful.