A slam-shut safety assembly configured to provide redundant safety shutoff in a gas distribution system. The slam-shut safety assembly includes a valve body, a first slam-shut safety device coupled to the valve body, and a second slam-shut safety device coupled to the valve body. The valve body has an inlet, an outlet, and defines a flow path extending between the inlet and the outlet. The first slam-shut safety device is configured to block the flow path at a first position responsive to an overpressure condition or an underpressure condition. The second slam-shut safety device is configured to block the flow path at a second position responsive to the overpressure condition or the underpressure condition.

Flow control devices herein have a housing defining a plurality of parallel conduits. The first conduit has a normally closed check valve defined to open under a first preselected pressure differential controlling flow through the first conduit in a first direction of flow. The second conduit has a normally neutral check valve defined to open under a second preselected pressure differential in a second direction of flow that is opposite the first direction of flow. The third conduit defines a restriction profile, i.e., has a restrictor, having a third preselected pressure differential. The flow control devices are included as part of an engine system, more specifically a crankcase ventilation breach detection system.

A breach detection system for an internal combustion engine having a crankcase, an intake manifold, a positive crankcase ventilation valve, a crankcase ventilation tube with a flow control system therein, and a pressure sensor between the flow control system and the crankcase. The flow control system subdivides the crankcase ventilation tube into a plurality of parallel conduitsa first conduit having a normally closed check valve that opens under a first preselected pressure drop in a first direction from the air intake to the crankcase, and a second conduit having either a second check valve that opens under a second preselected pressure drop in a second direction opposite the first direction or a restriction profile having a third preselected pressure drop that is the same in both the first and second direction. When the pressure sensor detects no pressure drop there is a breach in the system.

A hydraulic valve includes a valve housing, a valve cone, a spring housing, a check valve, a first hydraulic connection and a second hydraulic connection. The valve housing has a valve seat and the valve cone is movable in the valve housing between a closed position and an open position. In the closed position, the valve cone is in contact with the valve seat and blocks a first flow path between the first and the second hydraulic connection. In the open position, the valve cone is lifted off the valve seat and the first flow path is opened. A spring element is disposed in the spring housing, which biases the valve cone into the closed position. The check valve is disposed in the valve cone and opens a second flow path from the second hydraulic connection to the first hydraulic connection when pressure is applied to the second hydraulic connection.

A slam-shut safety assembly configured to provide redundant safety shutoff in a gas distribution system. The slam-shut safety assembly includes a valve body, a first slam-shut safety device coupled to the valve body, and a second slam-shut safety device coupled to the valve body. The valve body has an inlet, an outlet, and defines a flow path extending between the inlet and the outlet. The first slam-shut safety device is configured to block the flow path at a first position responsive to an overpressure condition or an underpressure condition. The second slam-shut safety device is configured to block the flow path at a second position responsive to the overpressure condition or the underpressure condition.

A pressure control system configured to respond to high-pressure conditions in a fluid conduit is disclosed. The system generally includes first and second flow restrictors positionable inline on a fluid conduit and configured to block fluid flow in the conduit and respond to a high-pressure event to allow fluid flow therethrough. The first flow restrictor is position upstream from the second flow restrictor and may open to allow fluid flow in response to the high-pressure event. The second flow restrictor provides adjustable flow of fluid therethrough or may open a bypass line in response to the high-pressure event to allow unrestricted fluid flow therethrough.

A valve with an inlet and an outlet has a solenoid valve as well as a pressure regulator within a housing. When the solenoid valve is off, no flow proceeds to the pressure regulator or outlet. When the solenoid valve is on, the pressure regulator functions as designed to regulate pressure out the outlet. The solenoid valve may have a seal acting on a second orifice and the pressure regulator may have a poppet acting on a first orifice. The first and second orifices may be parallel, colinear, and/or coaxial for many embodiments.

A valve body-side abutment surface 21x which is vertical to moving directions of the valve body 21 and the shaft 31 is formed on the valve body 21, a shaft-side abutment surface 31x which is vertical to the moving directions of the valve body 21 and the shaft 31 is formed on the shaft 31, a valve seat-side abutment surface 41x which is vertical to the moving directions of the valve body 21 and the shaft 31 is formed on the flow rate control passage 13, a valve-closing abutment portion 41y which projects in a ring-shape is formed on the valve body-side abutment surface 21x or the valve seat-side abutment surface 41x, a valve body-pressing abutment portion 31y which projects in a ring-shape is formed on the valve body-side abutment surface 21x or the shaft-side abutment surface 31x, the shaft 31 and the shaft-side diaphragm 32 are formed of composite material which is made by bonding PTFE and cross-linked PTFE to each other, the shaft-side diaphragm 32 is formed of the PTFE, and the shaft-side abutment surface 31x is formed of the cross-linked PTFE.

A pipe coupling structure includes an electromagnetic valve and a passage block having an upper surface mounted with the electromagnetic valve and opposite side surfaces formed with an inlet port and an outlet port. The inlet port is connected to a PCV pipe through an inlet pipe joint, and the outlet port is connected to a PCV pipe through an outlet pipe joint. At least one of the inlet pipe joint and the outlet pipe joint is a union joint. The union joint includes a hollow cylindrical union end making contact with a first surface formed with the inlet port or a second surface formed with the outlet port and a hollow cylindrical union nut configured to connect the inlet port or the outlet port to the union end.

A hydraulic valve includes a valve housing, a valve cone, a spring housing, a check valve, a first hydraulic connection and a second hydraulic connection. The valve housing has a valve seat and the valve cone is movable in the valve housing between a closed position and an open position. In the closed position, the valve cone is in contact with the valve seat and blocks a first flow path between the first and the second hydraulic connection. In the open position, the valve cone is lifted off the valve seat and the first flow path is opened. A spring element is disposed in the spring housing, which biases the valve cone into the closed position. The check valve is disposed in the valve cone and opens a second flow path from the second hydraulic connection to the first hydraulic connection when pressure is applied to the second hydraulic connection.