A frictionless rotary valve comprising: a valve body to be connected within a gas meter, the valve body comprising: a seal, fixedly attached near an outlet of the valve body; and a valve disc, having a ball bearing attached to the valve body; and a gear mechanism comprising: a worm wheel engaged with a worm, wherein the worm wheel is attached to a second end of the valve disc; a drive gear connected to the worm, wherein a rotation of the drive gear in a clockwise direction rotates the worm wheel in an anti-clockwise and moves the valve disc in a closed position; a worm wheel stop, for restricting a movement of the worm wheel in the anti-clockwise direction and driving the worm wheel in a vertically upward direction; and a linear guide attached to the worm wheel.

The present disclosure relates to a DBB forced sealing valve and an operating mechanism, including a valve body, a valve seat, a valve core arranged in the valve body, upper sealing member driving part and lower sealing member driving part arranged in the valve body and located on either side of the valve core, and the sealing members arranged between the valve seats and the upper sealing member driving part and the lower sealing member driving part. Wherein, the upper sealing member driving part and the lower sealing member driving part can move along the rotation axis of the valve core, and the upper sealing member driving part and the lower sealing member driving part drive the sealing members to press against or to retract from the valve seats.

A ball valve with a ball rotatably mounted within the housing. The ball is rotatable between an opened configuration, in which fluid flows through the ball, and a closed configuration, in which a ball seat engages a housing seat to prevent fluid from flowing through the ball valve. The ball may include one or more biasing members that urge the ball seat away from the ball and toward the housing seat. An engaging face of the ball seat may have a spherical or toroidal shape and an engaging face of the housing seat may have a conical shape. The ball seat may have up to six degrees of freedom related to the ball when the ball is in the closed configuration and the ball valve under pressure.

A top-entry trunnion ball valve comprising: a housing formed having first and second fluid flow ports, a cavity through which fluid flows when the valve is open and a top opening through which the cavity is accessible; a ball housed in the cavity formed having a through hole for passage of fluid and rotatable between open and closed positions; a cartridge in the cavity sealed to the housing and comprising a seat sealed to the ball; wherein the cartridge and top opening are sized to enable the cartridge to be inserted into and sealed to the housing and removed from the cavity via the top opening.

A frictionless rotary valve comprising: a valve body to be connected within a gas meter, the valve body comprising: a seal, fixedly attached near an outlet of the valve body; and a valve disc, having a ball bearing attached to the valve body; and a gear mechanism comprising: a worm wheel engaged with a worm, wherein the worm wheel is attached to a second end of the valve disc; a drive gear connected to the worm, wherein a rotation of the drive gear in a clockwise direction rotates the worm wheel in an anti-clockwise and moves the valve disc in a closed position; a worm wheel stop, for restricting a movement of the worm wheel in the anti-clockwise direction and driving the worm wheel in a vertically upward direction; and a linear guide attached to the worm wheel.

A ball valve is disclosed herein. The ball valve can include a non-planar seal disposed upon a rotating ball, the ball and seal contained within a housing, wherein the seal includes a first section and a second section, the first section oriented at a different angle than the second section. The ball valve can further include a mating surface disposed within the housing adjacent to the ball, the mating surface arranged to fully contact the seal when the ball valve is in a closed position, the mating surface including a first section and a second section, the first section oriented at a different angle than the second section. The seal and mating surface can be oriented so that the first section of the seal does not contact the second section of the mating surface when the ball is rotated between a closed position and an open position.

A plug that contacts both an upstream seat and a downstream seat based on a upstream spring creating first forces on the upstream seat and a downstream spring creating second forces on the downstream seat. The first forces may be in a downstream direction and the second forces may be in an upstream direction. Additionally, the upstream chamber and the downstream chambers may be dependent pistons that are configured to create dynamic forces acting upon the plug.

Valves having seats and counterseats with various contours are provided. In one embodiment, a valve includes a body and a flow control assembly inside the body. The flow control assembly includes a ball, a seat installed on the ball, and a counterseat. The ball is rotatable between open and closed positions to control flow through the body and the seat and counterseat include mating surfaces that engage when the ball is in the closed position such that the seat seals against the counterseat along the mating surfaces. Further, the mating surface of the counterseat can be a concave surface, the mating surface of the seat can be a convex surface, and at least one of the mating surfaces can have a toroidal contour.

A valve device includes: a driving source making rotational motion; a rotated part provided rotatably around a predetermined axis; and a fluid passage portion having a flow hole for passing a fluid. The valve device further includes: a gear mechanism having gears to transmit rotational motion of the driving source to the rotated part by engagement between the gears to rotate the rotated part; and a biasing part biasing the rotated part toward one side in a circumferential direction with the predetermined axis at the center. The rotated part includes a rotor increasing or reducing an opening of the flow hole in conjunction with rotation of the rotated part and is rotated according to rotational motion of the driving source while being biased toward the one side in the circumferential direction by the biasing part.

A low pressure, low operating force valve, for applications where automated valves are used, having reduced power requirements for an associated actuator. A low torque ball valve of a fixed ball valve configuration for low to medium pressure applications, such as for an electric motor actuated residential shutoff valve where pressures are typically below 100 psi, and commonly less than 60 psi, for example. The valve can be open or shut using a smaller electric motor than would be required for a conventional residential floating ball shutoff valve of a similar size. As such, the power requirements of the electric motor or other actuator are reduced allowing for the use of smaller motors, smaller power supplies and overall more efficient operation.