Description
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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)
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Output Indication
– Stainless steel disk or pointer and graduated scale
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Stroking Speed
– Dependent on actuator size, travel, spring rate, initial spring com• pression, and supply pressure. If stroking speed is critical, consult MORRIS VALVES.
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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
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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
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Construction Materials (refer to figure 1)
– Diaphragm Casing
– Sizes 30-87: Steel
– Size 80: Cast iron or Carbon Steel
– Size 100: Cast aluminum
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Diaphragm
– Sizes 30-87: Nitrile on nylon, Silicone on polyester
– Size 100: Nitrile on polyester
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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
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Actuator Spring: Steel
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Spring Adjustor: Steel
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Spring Seat: Steel or cast iron
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Actuator Stem: Steel
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Travel Indicator: Stainless steel
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O–Rings: Nitrile
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Seal Bushing: Brass
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Stem Connector: Zinc-plated steel
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Yoke
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Sizes 30-80: Cast iron or steel
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Size 100: Steel
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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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