to be negligible turning now the drawing figures first fig1 illustrates the new mud saver valve ii in the closed position spring 24 is the closing compression spring that is preloaded at assembly and pushes against a spring closing sleeve 23 which ultimately pushes against valve actuator u2014 sliding sleeve open close 32 and closes the valve the annulus pressure is fed through annulus pressure feed port 3 to the closing side of valve actuator u2014 piston 34 at valve actuator u2014 piston close valve pressure side 42 the pressure inside the pipe which with the same weight fluid in the pipe and annulus is equal to the annulus pressure is fed down inlet fluid conductor 6 to the valve actuator radial port through valve actuator radial port 7 and into inlet fluid cavity between the valve actuator housing and the valve actuator sliding sleeve 8 where it is blocked by sliding sleeve 32 and fed to valve actuator u2014 piston open valve pressure side 41 since the annulus and pipe pressure are equal the differential pressure across the pistons 34 is zero and the springs 24 pre load holds the valve closed fig1 illustrates the new mud saver valve ii in the open position fluid is shown flowing through the valve at the moment when the mud pumps are turned on and sliding sleeve 32 is in the closed position as shown in fig1 pressure builds quickly at valve actuator 41 which moves inlet fluid piston 34 to the open position fluid flows down inlet fluid conductor 6 and then through valve actuator radial port 7 where.