A ball valve with a typical pop-up head has a central vertical threaded insert for receiving a stem. A grit suppression sleeve is placed on the stem concentric with the stem. The grit suppression sleeve is generally a spool with a center hole fitting on the stem. The inside diameter of the stem is larger than the outside diameter of the suppression sleeve, permitting the sleeve to move freely on the stem and providing a controlled air way that will not carry grit, suppressing the grit that previously was exhausted through the main ball valve exit port.

A ball valve with a typical pop-up head has a central vertical threaded insert for receiving a stem. A grit suppression sleeve is placed on the stem concentric with the stem. The grit suppression sleeve is generally a spool with a center hole fitting on the stem. The inside diameter of the stem is larger than the outside diameter of the suppression sleeve, permitting the sleeve to move freely on the stem and providing a controlled air way that will not carry grit, suppressing the grit that previously was exhausted through the main ball valve exit port.

A valve includes: a housing defining a chamber communicating with an inlet port and an exhaust port, a seat disposed in the housing between the inlet port and the exhaust port; an elastomeric or polymer sealing ring disposed in the seat; a valve element having a sealing surface that is a body of revolution, the valve element positioned in the housing such that it is moveable between a closed position in which the sealing surface is engaged with the sealing ring and an open position in which the sealing surface is disengaged from sealing ring; and at least one bypass channel defined in the chamber, arranged to communicate between the seat and the exhaust port when the valve element is in the open position.

A valve includes: a housing defining a chamber communicating with an inlet port and an exhaust port, a seat disposed in the housing between the inlet port and the exhaust port; an elastomeric or polymer sealing ring disposed in the seat; a valve element having a sealing surface that is a body of revolution, the valve element positioned in the housing such that it is moveable between a closed position in which the sealing surface is engaged with the sealing ring and an open position in which the sealing surface is disengaged from sealing ring; and at least one bypass channel defined in the chamber, arranged to communicate between the seat and the exhaust port when the valve element is in the open position.

A breaker valve assembly for a nuclear reactor containment includes a valve body, a valve body insert, and a lid. The valve body includes a first side wall defining a chamber, a first opening in a top portion of the first side wall, and a second opening in a bottom portion of the first side wall. The second opening communicates with the first opening of the valve body. The valve insert body includes a second side wall defining a second chamber, and a third opening in a bottom portion of the second side wall. The valve insert body is nested in the valve body. The lid is arranged on an upper edge of the side wall of the valve insert body. The valve insert body is configured to move substantially vertically with respect to the valve body.

A breaker valve assembly for a nuclear reactor containment includes a valve body, a valve body insert, and a lid. The valve body includes a first side wall defining a chamber, a first opening in a top portion of the first side wall, and a second opening in a bottom portion of the first side wall. The second opening communicates with the first opening of the valve body. The valve insert body includes a second side wall defining a second chamber, and a third opening in a bottom portion of the second side wall. The valve insert body is nested in the valve body. The lid is arranged on an upper edge of the side wall of the valve insert body. The valve insert body is configured to move substantially vertically with respect to the valve body.

A fuel filter device includes a bag-shaped filter member filtering fuel that is drawn into a fuel pump, an inner frame member retaining the filter member in an expanded state, and a mounting member connected to the inner frame member and serving to communicate an internal space of the filter member with an outside. A valve chamber is defined by the inner frame member and the mounting member, and a check valve serving to prevent backflow of fuel is disposed in the valve chamber. The check valve includes a flat-plate shaped valve body having elasticity. The check valve opens against its weight when the fuel pump is operated, and the check valve closes due to its weight when the operation of the fuel pump is stopped.

A vehicle tank pressurization device has a valve seat establishing an opening for fuel vapours and/or air; such opening has a vertical axis coincident with the direction of application of an opening force, that is directed upwards and is produced, in use, by the pressure in an internal upper region of the tank; the device also has a movable shutter, placed on the valve seat, to open/close the valve seat, and having a weight set by design in such a way as to define the magnitude of a closing force directed downwards and with a center of gravity positioned eccentrically with respect to the vertical axis of the opening.

A vehicle tank pressurization device has a valve seat establishing an opening for fuel vapours and/or air; such opening has a vertical axis coincident with the direction of application of an opening force, that is directed upwards and is produced, in use, by the pressure in an internal upper region of the tank; the device also has a movable shutter, placed on the valve seat, to open/close the valve seat, and having a weight set by design in such a way as to define the magnitude of a closing force directed downwards and with a center of gravity positioned eccentrically with respect to the vertical axis of the opening.

The invention is a gas vent valve (10) for a gas pressure regulator (1), comprising: a tubular body (11) developed between two opposite openings (11a, 11b); a shutter body (12) biased towards a position in which a first opening (11a) of the tubular body (11) is closed and movable from the closed position towards an open position for opening the first opening (11a) due to the effect of a pressure acting from the outside of the tubular body (11) through the first opening (11a); constraining means (13) configured so as to prevent the movement of the shutter body (12) from the closed position towards the open position when the ambient temperature exceeds a predefined value.