Safety valve device

A safety valve device, comprising:

• a first safety valve and a second safety valve fluidically interconnected with the first safety valve, wherein each of the first and second safety valves has an actuating device, by means of which it can optionally be moved into a first switching state or a second switching state,
• wherein each of the first and second safety valves have a 4/2-way valve function, each of them having four valve ports, these being an inlet port designed for fluidic connection to a control valve controlling the feed and discharge of a working fluid, an outlet port designed for fluidic connection to a double-acting, fluid-actuated drive, and a first connecting port as well as a second connecting port, wherein the first connecting port of the first safety valve is fluidically connected to the second connecting port of the second safety valve and the first connecting port of the second safety valve is fluidically connected to the second connecting port of the first safety valve,
• wherein each of the first and second safety valves has a valve housing in which is formed a valve member receptacle space extending in a longitudinal direction along a longitudinal axis, in which receptacle space a valve member movable between a closed position defining the first switching state and an open position defining the second switching state while performing a switchover movement in the longitudinal direction is located,
• wherein in each of the first and second safety valves each of the four valve ports are disconnected from one another in a fluid-tight manner in the closed position of the valve member and the inlet port is fluidically connected to the first connecting port and the second connecting port is fluidically connected to the outlet port in the open position of the valve member,
• wherein each of the first and second safety valves has a first control structure for optionally blocking or enabling a fluid connection between the inlet port and the first connecting port and a second control structure located at a distance from the first control structure in the longitudinal direction for optionally blocking or enabling a fluid connection between the second connecting port and the outlet port,
• wherein each first control structure has a first control section formed at the valve member of the associated one of the first and second safety valves and having an annular first seal as well as an annular first valve seat formed at the valve housing, and wherein each second control structure has a second control section formed at the valve member of the associated one of the first and second safety valves and having an annular second seal as well as an annular second valve seat formed at the valve housing,
• wherein each valve member bears in its closed position with the first seal against the first valve seat and with the second seal against the second valve seat while forming a seal, and
• wherein each valve member is in its open position removed with the first seal from the first valve seat and with the second seal from the second valve seat, in each case opening up a flow cross-section, wherein the second control section having the second seal is in each valve member a part of an axial outlet end section of the valve member which, in the open position of the valve member, extends, without sealing contact to the valve housing, into a receptacle space end section of the valve member receptacle space and terminates in said receptacle space end section, the outlet port opening out into the receptacle space end section.