GB304994A - Improvements relating to the control of pumps for hydraulic power supply and like purposes - Google Patents

Abstract

304,994. Mearns, J., M. July 5, 1928. Regulating.-Hydraulic power supply plant comprises a steam engine or turbine g driving a centrifugal or turbine pump h, the supply of steam being controlled by a perforated throttle valve n, actuated from an accumulator a connected to the hvdraulic main b. The accumulator is loaded by steam derived from the main supply and adapted to pass through a port i, and pipe k into a cylinder l to hold the valve n open. When the accumulator ram rises, it first closes the port i, and subsequently acts through connections o, p to open a valve j controlling communication between the ends of the cylinder l, so that the valve n is closed by spring action. A recuperative arrangement comprises a cylinder y receiving steam bled from the engine g, this steam being subsequently compressed and returned to the supply main by a piston x, when liquid is supplied from the pump to a ram w, through a valve s. The valve s is connected to the main pump outlet valve rand is open when the liquid pressure is insufficient to open the latter valve. When the valve r is open, a valve u is also open so that liquid which has previously acted on the ram w returns to a liquid supply tank.