A pipe fitting configured for engagement with a coupling can include a first end, the pipe fitting defining a raised lip at the first end; and a second end disposed opposite from the first end, the pipe fitting defining a groove between the raised lip and the second end. A pre-assembled coupling assembly includes a coupling, the coupling defining a coupling bore extending through the coupling, the coupling including a gasket disposed within the coupling bore, the gasket being relaxed and uncompressed when the coupling is in a relaxed position; and a pipe fitting, the pipe fitting defining a first end and a second end, the first end inserted into the coupling bore, the coupling retained on the first end of the pipe fitting when the coupling is in the relaxed position.

A pipe fitting configured for engagement with a coupling can include a first end, the pipe fitting defining a raised lip at the first end; and a second end disposed opposite from the first end, the pipe fitting defining a groove between the raised lip and the second end. A pre-assembled coupling assembly includes a coupling, the coupling defining a coupling bore extending through the coupling, the coupling including a gasket disposed within the coupling bore, the gasket being relaxed and uncompressed when the coupling is in a relaxed position; and a pipe fitting, the pipe fitting defining a first end and a second end, the first end inserted into the coupling bore, the coupling retained on the first end of the pipe fitting when the coupling is in the relaxed position.

A check valve has an internal gate having an adjustable retention force, such that in the event that if the differential pressure between the upstream and downstream pressure changes, the force required to allow flow through the valve may be adjusted without removal of the valve from the piping system.

A nuclear reactor is designed to couple the load path of the control elements with the reactor core, thus reducing the opportunity for differential movement between the control elements and the reactor core. A cartridge core barrel can be fabricated in a manufacturing facility to include the reactor core, control element supports, and control element drive system. The cartridge core barrel can be mounted to a reactor vessel head, and any movement, such as through seismic forces, transmits an equal direction and magnitude to the control elements and the reactor core, thus inhibiting the opportunity for differential movement.

A nuclear reactor is configured with an intermediate coolant loop for transferring thermal energy from the reactor core for a useful purpose. The intermediate coolant loop includes a bypass flowpath with an air heat exchanger for dumping reactor heat during startup and/or shutdown. A fluidic diode along the bypass flowpath asymmetrically restricts flow across the bypass flowpath, inhibiting flow in a first flow direction during a full power operating condition and allowing a relatively uninhibited flow in a second direction during a startup and/or shut down low power operating condition.

A nuclear reactor is configured with a primary coolant loop for transferring heat away from the nuclear reactor core. In a shutdown event, the primary coolant pump may stop pumping primary coolant through the reactor core, resulting in decay heat buildup within the reactor core. An inertial energy coast down system can store kinetic energy while the nuclear reactor is operating and then release the stored kinetic energy to cause the primary coolant to continue to flow through the nuclear reactor core to remove decay heat. The inertial energy coast down system may include an impeller and a flywheel having a mass. During normal reactor operation, the flowing primary coolant spins up the impeller and flywheel, and upon a shutdown event where the primary coolant pump stops pumping, the flywheel and impeller can cause the primary coolant to continue to flow during a coast down of the flywheel and impeller.

A capacity control valve V includes a valve housing provided with a Pc port, a Pd port and a Ps port; a main valve body that includes a main valve portion which comes into contact with and separates from a main valve seat 10a to close and open a communication between a Pd port and the Pc port using a driving force of a solenoid; a pressure-sensitive valve capable of opening and closing, depending on a surrounding pressure, a first communication passage through which the Pc port and the Ps port are communicable with each other; and a differential pressure valve capable of opening and closing, depending on a pressure difference, a second communication passage through which the Pc port and the Ps port are communicable with each other.

A pressure relief assembly includes a pressure relief device including a housing that defines at least one air passage chamber, and at least one flap secured within the air passage chamber(s). The pressure relief device is configured to securely couple to a component. A cover is secured to the pressure relief device. At least one impact-absorbing bumper is disposed between the pressure relief device and the cover. The impact-absorbing bumper(s) is configured to dampen impact energy and undesirable noise.

A pressure relief assembly includes a pressure relief device including a housing that defines at least one air passage chamber, and at least one flap secured within the air passage chamber(s). The pressure relief device is configured to securely couple to a component. A cover is secured to the pressure relief device. At least one impact-absorbing bumper is disposed between the pressure relief device and the cover. The impact-absorbing bumper(s) is configured to dampen impact energy and undesirable noise.

There is provided an angle type check valve which enables simple and quick replacement operations of a valve body and a valve seat without releasing a piping coupled state and has excellent maintainability. In the angle type check valve according to the present invention, as a valve unit, a valve seat, a valve body, and a hinge mechanism are integrally assembled so as to be made into a unit part. The valve unit is attachable to and detachable from a unit fitting portion in the valve box main body. A gripping member is provided on the valve seat. As a result, access to the valve unit attached to the unit fitting portion through the access hole becomes remarkably easier. Therefore, a maintenance operator can perform a fitting operation and a removal operation of the valve unit to and from the unit fitting portion quickly with high work efficiency.