MTH Pumps P31 Series Regenerative Turbine Pumps0 pages

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P31 Series

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Regenerative Turbine Pumps

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Design Features

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• Capacities to 5 GPM

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• Heads to 250 Feet

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• Temperatures to 250°F

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• Stainless Steel Construction

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• Compact Size

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• Top Suction and Discharge

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• Adjustable Casing for Extended

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Service Life and Expanded

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Performance Envelope

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• Optional Integral

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Relief Valve

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Diagram & Specs

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(1) Stainless Steel Casing

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(2) Optional Integral Relief Valve

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(3) Stainless Steel Motor Bracket

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(4) Corrosion Resistant Impeller

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(5) Self-centering Balanced Impeller

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(6) Long lasting Mechanical Seals

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(7) High Efficiency Water Channel Design

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(8) High-Temp "O" Rings

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(9) Casing Adjusting Ring

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P31 on a Reversible 48 Frame Motor

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P31 on a Compact 36 Frame Motor

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Optional Features

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Internal Flush Line

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The P31 Series offers an optional

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internal seal flush to extend operating

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temperature to 250°F.

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Integrated Relief Valve

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P31 Pumps are available with or

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without a built-in relief valve*. The relief

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valve temporarily protects against dan-

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gerous over-pressure. All relief valves

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are preset at the factory to your specifi-

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cations (60 to 100 psi range available).

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At the specified relief valve setting, the

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flow will fully by-pass from the outlet to

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the inlet through the relief valve cham-

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ber. The specified relief valve setting is

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an average; individual pumps will vary

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both above and below the specified

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setting. The relief valve actually cracks

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open and begins to by-pass flow at

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approximately 50 psi below the relief

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valve setting. The standard relief valve

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is made of a special high temperature

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plastic.

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Optional Motor Capabilties

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All P31 pumps can fit onto ultra com-

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pact 36 Frame UL and CE approved

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motors, as well as Standard MTH dual

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face motors. Optional motors with

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higher horsepowers, solid state start-

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ing, TEFC enclosures, and 3 phase

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capabilities are also available.

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Construction Materials

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PART

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STANDARD CONSTRUCTION

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OPTIONS

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Motor Bracket and Casing

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Impeller

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Seals and "0" Rings

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(All Elastomers)

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Seals

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Seats

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316 Stainless Steel

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(AISI316)

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Bronze

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Viton A

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Carbon

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Ceramic

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W88

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20% Nickel Silver (ASTM B584)

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Buna

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EPR

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Neoprene

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G.L. Si Carbide

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G.L. Si Carbide

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Silicon Carbide

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Ni-Resist

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Shaft

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304 Stainless Steel

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Limitations

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Casing Pressure (Max.)

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Seal Pressure (Max.)*

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Suction Pressure (Max.)

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Suction Pressure (Min.)

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Speed" (Max.)

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Temperature

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Standard Construction

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Ceramic Seal Seat - Water

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G.I. Silicon Carbide Seal &

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Seat + Internal Seal Flush

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300 PSI

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200 PSI

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50 PSI

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26" Hg Vac.

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5500 RPM

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-20'

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+230'

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+250° F

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Horsepower

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1 Phase 1/3 HP

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3 Phase 1/3 HP

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'Suction Pressure Plus 50 Percent of Differential Pressure

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"With Variable Frequency Drive @90Hz

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*Be advised that due to the design of the relief valve, the relief valve reacts to the difference in pressure between the inlet and the outlet. As a result, the highest pressure, which the

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pump can develop at its discharge port, is the inlet pressure plus the specified relief valve setting

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