Present ocular drainage implants for refractory glaucoma reduce intraocular pressure by unregulated aqueous drainage often leading to postoperative hypotony. To reduce hypotony a passive pressure regulating shunt valve (PPRSV) was designed based on the single plate Molteno. The design incorporates a synthetic elastomer into a chamber within the basic Molteno structure. Aqueous pressure deforms the elastomer beneath a perforated plate to provide flow through holes to the subconjunctival space. A 10x prototype was evaluated with respect to flow rate and pressure for two different elastomers and plates. A pressure threshold of 4 mm of Hg was achieved below which no flow occurred. This threshold increased with increased elastomer stiffness. The rate of increase in flow beyond threshold was not affected by elastomer stiffness. The threshold decreased with five-holed vs one-holed plates. Above threshold five-holed plates had higher flow rates than single-holed plates. Performance was unaffected by orientation relative to gravity. The PPRSV can maintain pressure up to 4 mm of Hg and permit flow at higher pressures. The PPRSV devices may have utility as an alternative tube shunt device.