Open the Valves of Performance

Related Vendors

Although different set-ups and types of needle valves are available on the market, the basic design features are the same. In general, instrumentation needle valve characteristics are as follows:

Size: Up to 1 inch (25mm), variation determines the available flow control;

Pressure: up to 690 bar (10,000 psi);

Temperature: up to 650°C (1,200°F);

Configuration: straight or right-angle (90°) joint pattern;

Manual operation;

Safety requirements: proven design and burst pressure tests;

Proven raw material tractability;

Compliance with the following standards: MSS SP-99 (Instrument Valves) or equivalent; ASME B31.1 and ANSI/ISA 75.02 or ANSI/ISA 75.01 (Flow capacities).

Meeting the above standards is mandatory for any chosen needle-valve for any application. But with the diversity of metering solutions, it can be irritating to be spoilt for choice. Any valve selection has to be adapted to the specific required application and specific parameters of the process.

The stem makes the difference — the behavior of needle valves with different stem types (presented by different colors) and handle positions, i.e. the flow coefficient (Cv) vs handle turns.
(Pictures: HAM-LET)

In any needle-valves catalog, operation pressure and temperature rating are presented for each valve. Familiarization of the specific process operating conditions — pressure and temperature is a must, in order to reach a successful decision about the appropriate device. The needle-valves catalog provides generally all the information required referring to the valve operation condition limits as well as its characteristics behavior along operation conditions changes.

(ID:42501508)

Needle Valves

Open the Valves of Performance