HYDRAULIC VALVE FOR VACUUM BREAKOFF IN WATER OUTLETS OF THE SIPHON TYPE IN PUMPING STATIONS

摘要

1. hydraulic valve breakdown of vacuum сифонных водовыпусках pumping stations on the авт.св.№ 454315, отличающийс  what.in order to повышени  быстродействи  valve with stop valve fitted with an air pu