Patent ID: 8910660
Filing Date: 2014-12-16
Classification: F15B,Y10T

Abstract:
1. A valve arrangement for actuating a piston of a piston/cylinder arrangement for a hydraulic or fluidic device, and for actuating the piston/cylinder arrangement for actuating of a movable contact piece of a high-voltage circuit breaker, comprising: a main control valve arrangement including two 2/2-way valves as a first and a second main control valve which are activatable by a pilot control valve arrangement and provides a way for the fluid, which is under high pressure, to flow into a space above the piston and connects the space to a low-pressure tank for relieving pressure in the space, wherein the 2/2-way valves of each of the main and pilot control valve arrangements are separate from each other, wherein a second port of the first main control valve and a second port of the second main control valve are both connected at a first junction point to a third line section which issues into the space above the piston, wherein the 2/2-way valves of the main control valve arrangement are connected to a pilot control valve arrangement formed by two 2/2-way valves, such that the 2/2-way valves of the pilot control valve arrangement feed or deliver fluid to the main control valve arrangement at either a high pressure or a low pressure, wherein when the fluid, which is under high pressure, is supplied to the space above the piston, a first pilot control valve of the pilot control valve arrangement opens a path for the fluid which is under high pressure to flow into a main control face of the first main control valve, so that the first main control valve feeds the fluid which is at high pressure to the space above the piston and a second pilot control valve of the pilot control valve arrangement is closed, wherein when pressure is relieved in the space above the piston, the second pilot control valve opens a path from a main control face of the second main control valve to the low-pressure tank and the second main control valve opens a path from the space above the piston to the low-pressure tank, and wherein the high pressure fluid flows from the first pilot control valve to a main control face of the first main control valve.