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Cylinder Valves Designs (Handwheel Operated, Two-piece Spindle, Soft Seated) These valves, available in brass & stainless steel body, use diaphragms for gland sealing. The gland nut threads into the valve body & clamps the outer edges of the diaphragms against a ledge in the valve body to form a seal. The lower
The lower spindle assembly is non-threaded & non-lubricated, encased in a spring which forces it away from the seat when the valve is opened. The upper spindle is threaded into the gland nut. The valve opening is restricted by the stroke of the diaphragm, limiting the flow through the valve.
It is machined to accept the components to create the valve assembly & sealing system. Inlet Portion of the valve body that connects to the cylinder. Outlet Portion of the valve body through which gas is introduced or discharged.
The introduction of standards, such as EN ISO 10297, Gas cylinders -- Cylinder valves -- Specification and type testing, has made significant improvements to mitigate the risk of in-service issues. Historically, some basic design defects have occurred amongst valves from various manufacturers.
CYLINDER /VALVE ASSEMBLY. NAFFCOInert® cylinders shall be High Pressure Seamless Cylinder available in different capacities (i.e. 67, 80 & 140 Ltrs). The Cylinder filling pressure shall be either 200 Bar or 300 Bar to meet suitable system requirement. Cylinders arrives with valves pre-assembled.
Valve Functions and Basic Parts. Valves are the most common single piece of equipment found in DOE facilities. Although there are many types, shapes, and sizes of valves, they all have the same basic parts. This chapter will review the common parts and functions of a valve.
The control valve assembly typically consists of the valve body, the internal trim parts, an actuator to provide the motive power to operate the valve, and a variety of additional valve accessories, which can include positioners, transducers, supply pressure regulators, manual operators, snubbers, or limit switches.
