A medical fluid delivery machine comprising: a medical fluid pump including a pneumatically actuated pump chamber, first and second pneumatically actuated medical fluid valve chambers (212, 222) positioned to be inlet and outlet valves to and from the pneumatically actuated pump chamber, a positive pressure accumulator storing positive pressure air for delivery to the pneumatically actuated pump chamber and the first and second pneumatically actuated medical fluid valve chambers (212, 222), a pneumatic regulator located between the positive pressure accumulator and the pneumatically actuated medical fluid valve chambers for setting a desired positive pneumatic pressure, a first binary valve located pneumatically between the positive pressure accumulator and the first pneumatically actuated medical fluid valve chamber, a second binary valve located pneumatically between the positive pressure accumulator and the second pneumatically actuated medical fluid valve chamber, characterised by a third binary valve located pneumatically between the first pneumatically actuated medical fluid valve chamber and atmosphere, and a fourth binary valve located pneumatically between the second pneumatically actuated medical fluid valve chamber and atmosphere; and a control unit configured to cause (i) the first binary valve to close and the third binary valve to open to enable the first pneumatically actuated medical fluid valve chamber to fluidically open by venting positive pressure at the first pneumatically actuated medical fluid valve chamber to atmosphere, and (ii) the second binary valve to close and the fourth binary valve to open to enable the second pneumatically actuated medical fluid valve chamber to fluidically open by venting positive pressure at the second pneumatically actuated medical fluid valve chamber to atmosphere. a medical fluid pump including a pneumatically actuated pump chamber, first and second pneumatically actuated medical fluid valve chambers (212, 222) positioned to be inlet and outlet valves to and from the pneumatically actuated pump chamber, a positive pressure accumulator storing positive pressure air for delivery to the pneumatically actuated pump chamber and the first and second pneumatically actuated medical fluid valve chambers (212, 222), a pneumatic regulator located between the positive pressure accumulator and the pneumatically actuated medical fluid valve chambers for setting a desired positive pneumatic pressure, a first binary valve located pneumatically between the positive pressure accumulator and the first pneumatically actuated medical fluid valve chamber, a second binary valve located pneumatically between the positive pressure accumulator and the second pneumatically actuated medical fluid valve chamber, characterised by a third binary valve located pneumatically between the first pneumatically actuated medical fluid valve chamber and atmosphere, and a fourth binary valve located pneumatically between the second pneumatically actuated medical fluid valve chamber and atmosphere; and a pneumatically actuated pump chamber, first and second pneumatically actuated medical fluid valve chambers (212, 222) positioned to be inlet and outlet valves to and from the pneumatically actuated pump chamber, a positive pressure accumulator storing positive pressure air for delivery to the pneumatically actuated pump chamber and the first and second pneumatically actuated medical fluid valve chambers (212, 222), a pneumatic regulator located between the positive pressure accumulator and the pneumatically actuated medical fluid valve chambers for setting a desired positive pneumatic pressure, a first binary valve located pneumatically between the positive pressure accumulator and the first pneumatically actuated medical fluid valve chamber, a second binary valve located pneumatically between the positive pressure accumulator and the second pneumatically actuated medical fluid valve chamber, characterised by a third binary valve located pneumatically between the first pneumatically actuated medical fluid valve chamber and atmosphere, and a fourth binary valve located pneumatically between the second pneumatically actuated medical fluid valve chamber and atmosphere; and a control unit configured to cause (i) the first binary valve to close and the third binary valve to open to enable the first pneumatically actuated medical fluid valve chamber to fluidically open by venting positive pressure at the first pneumatically actuated medical fluid valve chamber to atmosphere, and (ii) the second binary valve to close and the fourth binary valve to open to enable the second pneumatically actuated medical fluid valve chamber to fluidically open by venting positive pressure at the second pneumatically actuated medical fluid valve chamber to atmosphere.