Pressure limiting valve
A high pressure container arrangement includes a reservoir having an outer wall and an over pressure relief orifice through which high pressure fluid may flow when the fluid pressure inside the reservoir exceeds a predetermined pressure threshold. The high pressure container arrangement also includes a pressure limiting valve having a housing in which is arranged a closing member permanently biased by a spring toward a closed position and, when the pressure in the reservoir exceeds the predetermined threshold the closing member is pushed in an open position. The housing of the pressure limiting valve is integral to the wall of the reservoir.
1. A high pressure container arrangement comprising:
a reservoir having an outer wall, an inlet which fills the reservoir with high pressure fluid, at least one outlet which delivers high pressure fluid to a fluid consuming device, and an over pressure relief orifice through which high pressure fluid flows when the fluid pressure inside the reservoir exceeds a predetermined pressure threshold; and
a pressure limiting valve comprising a housing integral to the reservoir in which is arranged a closing member permanently biased by a spring toward a closed position where the closing member is in sealing contact against a valve seat surrounding the over pressure relief orifice forbidding fluid to flow through the over pressure relief orifice and, when the pressure in the reservoir exceeds the predetermined threshold the closing member is pushed by the high pressure fluid away from the valve seat in an open position, enabling fluid to exit the reservoir via the over pressure relief orifice so that, the pressure in the reservoir decreases, the fluid exiting the reservoir via the over pressure relief orifice flowing through a low pressure outlet connectable to a drain circuit;
wherein the over pressure relief orifice extends through an inner wall integral to the outer wall of the reservoir, the inner wall limiting the reservoir on a first side and limiting the pressure limiting valve on a second side that is opposite the first side, the outer wall extending beyond the inner wall in a tubular shroud forming the housing of the pressure limiting valve in which are arranged the closing member and the spring;
the high pressure container arrangement further comprising a plug closing the tubular shroud, the spring being compressed between the plug and the closing member;
wherein the plug is threaded onto the housing such that a biasing force generated by the spring on the closing member is adjustable.
2. A container arrangement as set in claim 1 wherein the low pressure outlet is integrally formed in the housing of the pressure limiting valve.
3. A common rail arrangement for use in a direct injection system of an internal combustion engine, the common rail arrangement comprising:
a rail having a wall which is tubular shape and extends along a longitudinal axis, the rail also having an inlet which fills the rail with high pressure fuel, at least one outlet which delivers high pressure fuel to the internal combustion engine, and an over pressure relief orifice through which high pressure fuel flows when the fuel pressure inside the rail exceeds a predetermined pressure threshold; and
a pressure limiting valve comprising a housing integral to the wall of the rail and a closing member in the housing and permanently biased by a spring toward a closed position where the closing member is in sealing contact against a valve seat surrounding the over pressure relief orifice forbidding fuel to flow through the over pressure relief orifice and, when the pressure in the reservoir exceeds the predetermined threshold the closing member is pushed by the high pressure fuel away from the valve seat in an open position, enabling fuel to exit the rail via the over pressure relief orifice so that, the pressure in the rail decreases, the fuel exiting the rail via the over pressure relief orifice flowing through a low pressure outlet connectable to a drain circuit;
wherein the over pressure relief orifice extends through an inner wall integral to the outer wall of the reservoir, the inner wall limiting the reservoir on a first side and limiting the pressure limiting valve on a second side that is opposite the first side, the outer wall extending beyond the inner wall in a tubular shroud forming the housing of the pressure limiting valve in which are arranged the closing member and the spring;
the common rail arrangement further comprising a plug closing the tubular shroud, the spring being compressed between the plug and the closing member;
wherein the plug is threaded onto the housing such that a biasing force generated by the spring on the closing member is adjustable.
4. A common rail arrangement as set in claim 3 where the pressure limiting valve is longitudinally arranged at an extremity of the rail.
5. A common rail arrangement as set in claim 3 where the pressure limiting valve is radially arranged relative to the rail.