An apparatus for locking a sealing member of a valve in a piping system or an enclosed system comprises: (a) a locking mechanism housing having a upper end, a lower end opposed to the upper end, and a body between the upper end and the lower end; (b) at least a locking mechanism opening formed on the body; (c) at least a locking mechanism disposed in the locking mechanism opening; wherein the valve further comprises a valve housing and a sealing member; wherein the locking mechanism housing, the at least a locking mechanism opening, at least a locking mechanism, and the sealing member is disposed inside the valve housing; wherein a pressure P1 exists in the upper end of the locking mechanism housing; and wherein a pressure P2 exists in the lower end of the locking mechanism housing.

An apparatus for locking a sealing member of a valve in a piping system or an enclosed system comprises: (a) a locking mechanism housing having a upper end, a lower end opposed to the upper end, and a body between the upper end and the lower end; (b) at least a locking mechanism opening formed on the body; (c) at least a locking mechanism disposed in the locking mechanism opening; wherein the valve further comprises a valve housing and a sealing member; wherein the locking mechanism housing, the at least a locking mechanism opening, at least a locking mechanism, and the sealing member is disposed inside the valve housing; wherein a pressure P1 exists in the upper end of the locking mechanism housing; and wherein a pressure P2 exists in the lower end of the locking mechanism housing.

A valve device is provided. In the valve device, a valve element is rotated about a support shaft, based on rotation of a valve element drive member to switch a through hole that communicates with an outlet formed in a valve seat to adjust a flow rate. The through hole opens in a bottom surface of a flow channel securing groove formed in the valve element. The flow channel securing groove has a long hole shape in which a width in a first direction being a moving direction of the valve element, is smaller than a width in a second direction orthogonal to the first direction. Thus, a region overlapping with the outlet is large as compared to a case where a perfect circular flow channel securing groove is formed.

A water valve may include a valve shell, and a rotating base is installed in the valve shell. A lower end of the rotating base is sequentially connected to a driving valve piece and a fixed valve piece, and the driving valve piece and the fixed valve piece are installed in the valve shell. A bottom portion of the driving valve piece comprises a concave portion to form a mixing chamber, and the mixing chamber has a first mixing space and a second mixing space, and the diameter of the first mixing space is larger than the second mixing space so as to increase the coverage of the mixing chamber. Each of two sides of the second mixing space comprises a pressure relief slot.

A method for forming a monolithic bypass includes pouring a molten metal into a monolithic bypass mold cavity of a mold, the monolithic bypass mold cavity shaped complimentary to a shape of the monolithic bypass; forming the monolithic bypass, the monolithic bypass comprising a bypass valve body disposed between an upstream conduit and a downstream conduit, an inlet opening defined by the upstream conduit, an outlet opening defined by the downstream conduit, a bypass bore extending through the upstream conduit, the bypass valve body, and the downstream conduit from the inlet opening to the outlet opening, the inlet opening and the outlet opening configured to attach to a primary valve body, the monolithic bypass defining a U-shape, the monolithic bypass and the bypass bore each being seamless; and removing the monolithic bypass from the mold.

A method for forming a monolithic bypass includes pouring a molten metal into a monolithic bypass mold cavity of a mold, the monolithic bypass mold cavity shaped complimentary to a shape of the monolithic bypass; forming the monolithic bypass, the monolithic bypass comprising a bypass valve body disposed between an upstream conduit and a downstream conduit, an inlet opening defined by the upstream conduit, an outlet opening defined by the downstream conduit, a bypass bore extending through the upstream conduit, the bypass valve body, and the downstream conduit from the inlet opening to the outlet opening, the inlet opening and the outlet opening configured to attach to a primary valve body, the monolithic bypass defining a U-shape, the monolithic bypass and the bypass bore each being seamless; and removing the monolithic bypass from the mold.

A gate valve adapted for use in oil and gas operations, such as, for example, fracturing or gravel-packing operations. In an exemplary embodiment, the gate valve includes a valve body, which defines an internal region; a first fluid bore intersecting the internal region and defining a first interior surface in the valve body; and a first annular recess formed in the first interior surface and adjoining the internal region. A first seat element defines a second fluid bore and extends within the first annular recess. A first protective sleeve extends between respective portions of the first seat element and the valve body. The first and second fluid bores have first and second full-bore inside diameters, respectively. The first protective sleeve has a third full-bore inside diameter that is substantially equal to each of the first and second full-bore inside diameters.

A gate valve adapted for use in oil and gas operations, such as, for example, fracturing or gravel-packing operations. In an exemplary embodiment, the gate valve includes a valve body, which defines an internal region; a first fluid bore intersecting the internal region and defining a first interior surface in the valve body; and a first annular recess formed in the first interior surface and adjoining the internal region. A first seat element defines a second fluid bore and extends within the first annular recess. A first protective sleeve extends between respective portions of the first seat element and the valve body. The first and second fluid bores have first and second full-bore inside diameters, respectively. The first protective sleeve has a third full-bore inside diameter that is substantially equal to each of the first and second full-bore inside diameters.

A gate valve adapted for use in oil and gas operations, such as, for example, fracturing or gravel-packing operations. In an exemplary embodiment, the gate valve includes a valve body, which defines an internal region; a first fluid bore intersecting the internal region and defining a first interior surface in the valve body; and a first annular recess formed in the first interior surface and adjoining the internal region. A first seat element defines a second fluid bore and extends within the first annular recess. A first protective sleeve extends between respective portions of the first seat element and the valve body. The first and second fluid bores have first and second full-bore inside diameters, respectively. The first protective sleeve has a third full-bore inside diameter that is substantially equal to each of the first and second full-bore inside diameters.

A gate valve adapted for use in oil and gas operations, such as, for example, fracturing or gravel-packing operations. In an exemplary embodiment, the gate valve includes a valve body, which defines an internal region; a first fluid bore intersecting the internal region and defining a first interior surface in the valve body; and a first annular recess formed in the first interior surface and adjoining the internal region. A first seat element defines a second fluid bore and extends within the first annular recess. A first protective sleeve extends between respective portions of the first seat element and the valve body. The first and second fluid bores have first and second full-bore inside diameters, respectively. The first protective sleeve has a third full-bore inside diameter that is substantially equal to each of the first and second full-bore inside diameters.