Can Metering Valves Be Used as Shutoff Valves?

07/27/2023
963

Can Metering Valves Be Used as Shutoff Valves?

 

Metering valves are designed to provide accurate and stable flow rates in analytical and research applications. As metering valves are similar in construction to needle valves, a common question from customers is: can metering valves be used as shutoff valves? The answer is simple: not all metering valves can be used as shutoff valves.

 

Recently there is a typical case: a customer bought FITOK MS series metering valves and the site operator mistakenly thought that these metering valves provide shutoff service. When he rotated the handle to the end but found that the flow rate was still not zero, he further rotated the handle until breaking the stem. See the figure below:

 

Metering Valves

 

When choosing metering valves, it is important to consider parameters such as flow rate, orifice size, working temperature and pressure, but the shutoff service cannot be ignored. For example, FITOK ML and MH series metering valves provide shutoff service because they have a tapered surface at the stem to form a seal with the valve body, and the stem materials are hardened 316 stainless steel and 440C stainless steel, which have higher strength than general 316 stainless steel. However, for FITOK MS and MV series metering valves, the shutoff service is not available.

 

Construction of ML&MH Series Metering Valves

 

High-Quality Metering Valves from FITOK

 

MS Series Low Flow Metering Valves

MS Series Low Flow Metering Valves

  • Working pressure up to: 2000 psig (138 bar)
  • Working temperature: -10°F to 400°F (-23°C to 204°C)
  • Orifice size: 0.032" (0.81 mm)
  • Max. flow coefficient (Cv): 0.004
  • Turns to open: 9 to 12
  • Shutoff service: not available

MV Series Medium Flow Metering Valves

MV Series Medium Flow Metering Valves

  • Working pressure up to: 1000 psig (69 bar)
  • Working temperature: -10°F to 400°F (-23°C to 204°C)
  • Orifice size: 0.056" (1.42 mm)
  • Max. flow coefficient (Cv): 0.03
  • Turns to open: 8 to 10
  • Shutoff service: not available

 

ML Series High Flow Metering Valves

ML Series High Flow Metering Valves

  • Working pressure up to: 1000 psig (69 bar)
  • Working temperature: -10°F to 400°F (-23°C to 204°C)
  • Orifice size: 0.128" (3.25 mm)
  • Max. flow coefficient (Cv): 0.15
  • Turns to open: 10 to 11
  • Shutoff service: available

MH Series Medium Flow High Pressure Metering Valves

MH Series Medium Flow High Pressure Metering Valves

  • Working pressure up to: 5000 psig (345 bar)
  • Working temperature: -65°F to 850°F (-54°C to 454°C)
  • Orifice size: 0.062" (1.6 mm)
  • Max. flow coefficient (Cv): 0.04
  • Turns to open: 9 to 10
  • Shutoff service: available

 

Please see the Metering Valves Catalog for more information. Should you have any questions, please contact us directly and We will reach you soon.

 

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