Siemens Building Technologies Two-way Valves Data Sheet

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Two-way Valves

1/2 to 1-inch
Normally Open or Normally Closed

Powermite

MT Series Globe

Powermite MT Series

Two-way Globe Valve.

Description

The Powermite MT Series Two-way Globe Valves are
designed to work with either a pneumatic or electronic
actuator with a 7/32-inch (5.5 mm) stroke. Compatible
actuators deliver a minimum of 67 lbf. (300 N) of force.

Features

• Direct-coupled universal bonnet/No tools required
for installation

• Choice of brass or stainless steel trim

• ANSI Leakage Class IV (0.01% of Cv)

• ANSI Class 250 body

• Available in 3 to 8 psig, 8 to 13 psig or 10 to 15 psig
spring ranges with pneumatic actuation

• Rated for 15 psig steam with stainless steel trim

• Interchangeable pneumatic or electronic actuators

• Orderable as a valve only or as a complete
valve/actuator assembly

Applications

The Powermite MT Series Globe Valves are used
for hot or chilled water or low pressure steam (<15 psig
with stainless steel trim only) control on convectors, fan
coil units, unit conditioners, radiation, reheat coils, and
similar terminal units.

Recommendation:

Only use the MT Series Valve Actuators. When using
this valve with a pneumatic actuator, note that MT valve
bodies have the spring in the body, rather than the
actuator. To order the correct valve body, select the
proper spring range.

Alternate spring ranges for pneumatic sequencing are
available as valve and actuator factory assemblies only.

A-135

Valves

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Two-way MT Series Valve Specifications

A-136

Valve Size .............................................................1/2 to 1" (15 to 25 mm)

Body Style ....................................................................................... Globe

Seat Style ...........................................................................Metal to Metal

Action ........................................................................................... NO/NC

Valve Body Rating .......................................................... ANSI Class 250

Stem Travel (Stroke) .........................................................7/32" (5.5 mm)

Materials

Body ...................................... Forged Brass C37700 (1/2 and 3/4 inch)

or UNS CA 844 Bronze (1 inch)

Trim ................................................................ Stainless Steel or Brass

Stem ...........................................Stainless Steel ASTM A582 Type 303

Packing ........................................................................... EPDM O-rings

Controlled Medium .................Water, Steam, Glycol Solutions up to 50%

Spring Range

Standard

Normally Closed ....................................... 10 to 15 psig (69 to 103 kPa)

Normally Open ............................................... 3 to 8 psig (21 to 55 kPa)

Optional

Normally Closed ............................................. 3 to 8 psig (21 to 55 kPa)

8 to 13 psig (55 to 90 kPa)

Normally Open ............................................. 8 to 13 psig (55 to 90 kPa)

10 to 15 psig (69 to 103 kPa)

Accessories & Service Kits

Medium Temperature Range ........................... 35 to 250°F (2 to 120°C)

Max. Recommended Differential
Pressure for Liquid Modulating Service

Brass Trim ................................................................... 25 psi (173 kPa)

Stainless Steel Trim ..................................................... 50 psi (345 kPa)

Steam Stainless Steel Trim ......................................... 15 psi (103 kPa)

Rangeability

Cv<1 ............................................................................................... >50:1

Cv>1 ............................................................................................. >100:1

Close-off Ratings ......................................... According to ANSI/FCI 70-2

Leakage Rate ....................................................... Class IV (0.01% of Cv)

Flow Characteristics .................................... Modied Equal Percentage

Mounting Location .............................................. NEMA 1 (Interior Only)

Refer back to the Selection Charts at the beginning of this section

to make sure the conguration is valid.

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Valves

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