Ham-Let® H-300U needle valves are advanced high pressure instrumentation needle valves for shut-off service, its packing bolt design for easy mounting being the best solution for instrumentation panels.
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These compact needle valves enable relatively high level of flow regulation and long-life service. Special stem surface treatment, based on low temperature carbon diffusion, enables higher surface hardness with improved wear resistance, resistance to system contaminations and optimal operational torque.
These H-300U needle valves were designed for high pressure services where moderately uncontaminated media is used.
For steam applications, it is recommended to select one of Ham-Let
severe service needle valves.
For relatively high pressure pure oxygen applications, assure that the
selected valve is tested and found to meet the specific application requirements.
H-300U needle valves are available with a choice of stem tips:
- Regulating: Used where some degree of flow control is required.
- V-Stem: Standard stem tip used for on/off operation in general-purpose liquids and gas service.
- Non-Rotating: Typically used in high-cycle applications to extend valve life and prevent stem rotation inside the body tip, a suitable selection for gaseous high pressure applications.
- Soft seat: soft seat tip requires lower seating torque than a metal stem tip; the best choice for clean gaseous high pressure applications. Maximum allowable working temperature is 200°F (93°C).
Testing:
- The H-300U design has been tested for Burst and Proof.
- Every H-300U needle valve is factory tested with nitrogen at 1000 psig.
- Maximum allowable leakage across the seat is 0.1 std cc/min.
Packing Adjustment:
- Due to the varied service applications of the valve, packing adjustment may occasionally
be necessary.
- Packing is factory adjusted to 1000 psig service. Initial packing adjustment is recommended after installation and prior to start-up.
- Please see packing adjustment procedure for more details.