A stuffing box assembly for a valve includes a stuffing box and a packing module. The packing module carries one or more seals to engage with the stuffing box and a valve stem extending through the stuffing box. The packing module is able to be installed into, and removed from, the stuffing box as a single assembly. A valve stem can be formed with an integral ball on one end for engaging with a valve seat. The seals of the packing module create a fluid-tight seal against the valve stem and the stuffing box to inhibit fluid leakage through the stuffing box.

A system including a valve. The valve includes a valve body having an interior volume and a bore along a first axis. A stem extends along a second axis and a flow control element couples to the stem. The stem selectively moves the flow control element through the interior volume between a closed position and an open position relative to the bore. A valve insert system retains a pressurized lubricant in the interior volume.

Example aspects of a bushing assembly for a bonnet and stuffing box assembly, a bonnet and stuffing box assembly, and a method for using a bonnet and stuffing box assembly are disclosed. The bushing assembly for a bonnet and stuffing box assembly can comprise a stuffing box bushing, the stuffing box bushing defining an outer stuffing box bushing surface and a stuffing box bushing bore wall; and a bonnet bushing, the bonnet bushing defining an outer bonnet bushing surface and a bonnet bushing bore wall, the bonnet bushing bore wall and the stuffing box bushing bore wall together defining a bushing bore configured to receive a stem therethrough.

Valve stem packing assemblies may include at least one end ring and at least one sealing ring. The at least one end ring may include an inner ring and an outer ring. Valves include a valve body, a valve stem, and a valve stem packing assembly.

Valve stem packing assemblies may include at least one end ring and at least one sealing ring. The at least one end ring may include an inner ring and an outer ring. Valves include a valve body, a valve stem, and a valve stem packing assembly.

A valve is disclosed with a clamp mechanism that accepts interchangeable outlet connections. The interchangeable outlook connections may have different sealing geometries, where different sealing geometries are specified to be used with different gases. For use with a particular gas, the valve may be configured with the interchangeable outlook connection with the sealing geometry that is appropriate for that gas.

Valve stem packing assemblies may include at least one end ring and at least one sealing ring. The at least one end ring may include an inner ring and an outer ring. Valves include a valve body, a valve stem, and a valve stem packing assembly.

Various devices and techniques related to magnetically-actuated valves are generally described. Magnetically-actuated valves may include mechanisms to completely seal the valve during normal operation. However, mechanical access to the internal actuation mechanism may be temporarily provided in the event of a stuck valve. Access to a mechanical non-magnetically coupled portion of the internal actuation member may be provided for emergency access. The access to the internal actuation member is sealed off under normal operating conditions. A sealed port covers the portion of the internal actuation member during normal magnetically-coupled operation, but can be removed for direct mechanical access to the actuator. Furthermore, a backup seal may be sheltered within this port. The backup seal is typically not exposed to the outside environment or degradation, but prevents leaks during emergency actuation when access to the internal actuation member is temporarily provided.

Various devices and techniques related to magnetically-actuated valves are generally described. Magnetically-actuated valves may include mechanisms to completely seal the valve during normal operation. However, mechanical access to the internal actuation mechanism may be temporarily provided in the event of a stuck valve. Access to a mechanical non-magnetically coupled portion of the internal actuation member may be provided for emergency access. The access to the internal actuation member is sealed off under normal operating conditions. A sealed port covers the portion of the internal actuation member during normal magnetically-coupled operation, but can be removed for direct mechanical access to the actuator. Furthermore, a backup seal may be sheltered within this port. The backup seal is typically not exposed to the outside environment or degradation, but prevents leaks during emergency actuation when access to the internal actuation member is temporarily provided.

A bonnet and stuffing box assembly includes a bonnet defining a bonnet bore; a stuffing box connected to the bonnet, the stuffing box defining a stuffing box bore, the stuffing box bore and bonnet bore defining an assembly bore; a bushing assembly received in the assembly bore and comprising a stuffing box bushing and a bonnet bushing, the stuffing box bushing defining a narrow portion disposed in the stuffing box bore and a wide portion at least partially disposed in the bonnet bore, the bonnet bushing disposed in the bonnet bore and confronting the wide portion of the stuffing box bushing, the bushing assembly defining a bushing bore extending through the stuffing box bushing and the bonnet bushing; and a stem extending through the bushing bore.