The BLLYCO POV701‑BN Series is a direct‑acting 2/2‑way pneumatic on‑off valve built with brass valve body and NBR seals for general‑purpose water, gas and oil media; available from DN15 (1/2") to DN50 (2"), it works under PN10 nominal pressure, adapts to rough vacuum down to ‑0.9 bar(g), negative‑pressure and zero‑pressure conditions, offers standard double‑acting (DA) actuator as well as optional spring‑return single‑acting air‑to‑open (AO) and air‑to‑close (AC) configurations, features simple direct‑acting construction, fast response, high continuous‑operation reliability and IP65 actuator protection grade, widely used for fluid on‑off control in industrial automation fluid systems.