HOKE - Needle valves
Stem tip options


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Stem tip options:
HOKE Needle Valves are Offered With a Choice of Stem Tip Options to Provide Greater Flexibility
Offered in four different body materials, this group of valves can handle a wide range of general purpose liquid and gas applications. Six types of stem tips are available, including two styles of vee-points.
Blunt Vee-Point The blunt vee-point stem tip provides full flow with only a few turns of the valve handle Vee-Point The vee-point stem tip is used to provide leak-tight shutoff in small orifice valves.

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Regulating The regulating stem tip has a gradually tapered tip which allows for greater control of flow. PCTFE A PCTFE stem tip requires a lower seating torque than a metal stem tip. It will provide full flow through the valve with only a few handle turns. The PCTFE tip is replaceable and has a maximum temperature of 121° C
Non-rotating Metal Stem Tip
A non-rotating stem tip is typically used in high cycle applications to extend the service life of the valve. Its purpose is to prevent galling in the seat and on the stem tip. As the valve is closed, the stem tip contacts the valve seat, and is driven straight into it without rotating.		 Non-rotating PCTFE Stem Tip
A non-rotating PCTFE stem tip operates in the same fashion as the non-rotating metal stem tip but requires less seating torque.

Dyna-Pak® Stem Packing System

Dyna-Pak® provides superior sealing performance while reducing maintenance costs. Consisting of alternate wafers of TFE and metal spacers, stem leakage is virtually eliminated while the problems associated with TFE cold flow are minimized .

As the packing nut is tightened, metal spacers squeeze the TFE wafers, driving the TFE against the stem. At the stem, forces are concentrated and the TFE wafers provide multiple line seals. In addition to squeezing the TFE wafers, the metal spacers help contain the TFE and drastically reduce its ability to creep.

Dyna-Pak® packing has the ability to:

  • Utilize system pressure to increase effectiveness in eliminating leakage
  • Provide reduced operating torque
  • Help eliminate fugitive emissions
  • Reduce the need for frequent packing adjustments
  • Operate in temperatures from -54° to +232° C

Please contact us for further information or for a quotation: info@lenntech .com

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