MV657-MV667 DIAPHRAGM ACTUATORS

FEATURES:

  • Application Versatility-Five actuator types in eleven sizes are available. Spring rates, travel stops, and Handwheels are available for nearly any linear control valve application.
  • Excellent Linearity Between Loading Pressure and Travel-A molded diaphragm travels in a deep diaphragm casing, minimizing area change throughout the travel.
  • High Degree of Dynamic Stability and Frequency Response•
  • A shallow casing on the pressure side means reduced volume on that side, thereby minimizing response time.
  • High Thrust Capability-The molded diaphragm allows maximum thrust for given diaphragm size.
  • Long Service Life-Rugged thick-walled cast iron and steel construction provides increased stability, corrosion protection, and protection from deformation should over-pressurization occur.
  • Cold Service Applications-Enhanced product specifications for all sizes of MV657 and MV667 diaphragm actuators allow performance to -50C (-58 F). Use of a positioner is recommended to ensure responsiveness in applications operating below -40 9C (-40 F).
  • Positive Connections-A split block stem connection pro• vides a solid transfer of motion while allowing easy mounting. The absence of linkages helps to avoid lost motion and inaccurate valve positioning.
Download Technical Specifications

Description

  • Standard Operating  Pressure Range (1)

– MV657 and MV667: 3 to 15 psig or 6 to 30 psig

– MV657-4 and MV667-4: 3 to 27 psig

– MV667 Size 76: 6 to 30 psig or Oto 45 psig)

  • Output Indication

– Stainless steel disk or pointer and graduated scale

  • Stroking Speed

– Dependent on actuator size, travel, spring rate, initial spring com• pression, and supply pressure. If stroking speed is critical, consult MORRIS VALVES.

  • Operating Temperature Range (1)

– Standard Construction (Nitrile Elastomers): -40 to

82°C (-40 to 180F)

– Optional Construction (Silicone Diaphragm): -40 to

149C (-40 to 300°F).

– Maximum  Valve Packing Box Temperature: 427 C (800F) with cast iron yoke

  • Signal Connections:

– Sizes 30- 60 and MV667 Size 76:  1/4 NPT internal  bushing

– Sizes 70 and 87: 1  /2 NPT internal with 1  /4 NPT internal  bushing

– Size 80

– MV657: 3/4 NPT internal with 1  /4 NPT internal  bushing

– MV667: 1 /2 NPT internal with 1  /4 NPT internal  bushing

– Size 100: 1    NPT internal with  1/4 NPT internal  bushing

  • Construction Materials (refer to figure 1)

– Diaphragm  Casing

– Sizes 30-87: Steel

– Size 80: Cast iron or Carbon Steel

– Size 100: Cast aluminum

  • Diaphragm

– Sizes 30-87: Nitrile on nylon, Silicone on polyester

– Size 100: Nitrile on polyester

  • Diaphragm  Plate

MV657 Sizes 30- 60,100: Cast aluminum

MV657 Sizes 70-87: Cast iron or Carbon steel

MV667 Sizes 30-60, 100: Cast aluminum or Carbon Steel

MV667 Sizes 70-87: Cast iron or Carbon steel

  • Actuator Spring: Steel

  • Spring Adjustor: Steel

  • Spring Seat: Steel or cast iron

  • Actuator Stem: Steel

  • Travel Indicator: Stainless steel

  • ORings: Nitrile

  • Seal Bushing: Brass

  • Stem Connector: Zinc-plated steel

  • Yoke

  • Sizes 30-80: Cast iron or steel

  • Size 100: Steel

  • Construction Materials for Cold Service

[to -50°C(-58 F)] MV657 and MV667–all sizes

Yoke: Steel (Grade LCC) Diaphragm: Silicone

O-Rings:(3) Ethylene Propylene

Bolting: Stainless Steel  B8M CI 2

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