Table 1. Geometry of retention burst valves (RBVs) for autonomous delivery of four liquids. Junction pressures during drainage of RBVs were calculated using eqn (3).

	RBV1	RBV2	RBV3	RBV4
Width (μm)	960	670	480	380
Height (μm)	1000	750	650	550
RBV pressure P i (Pa)	–194	–271	–358	–441
P J during drainage (Pa)	–238	–309	–390	–443