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These three-port mixing valves are used for modulating control of hot/chilled water or steam in heating, ventilation, and air conditioning systems and can be operated by electric linear actuators ML6420/ML6425, ML7420/ML7425, and ML6421/ML7421 or by pneumatic actuator MP953.


  • Cast iron body with flanged end connections
  • Low seat leakage rate
  • Metal-to-metal seating for long life span
  • Self-adjusting packing
  • Accurate positioning to ensure state-of-the-art temperature control
  • Easy mounting of direct-coupled electric and pneumatic actuators
  • Constant total flow throughout entire plug travel

Product Specifications

Closed circuit heating systems, hot water quality
Maximum Safe Operating Pressure (kPa)
Fluid at 120 C - 4000 kPa; Fluid at 150 C - 3920 Kpa; Fluid at 200 C - 3800 kPa; Fluid at 220 C - 3720 kPa
Used With
ML6421B; ML7421B; MP953A; MP953C
Item Type
Pressure Range (psi)
PN25 to PN40
Connection Type
Body Pattern
Three-way mixing
Pipe Size (inch)
4 in.
Pipe Size (DN)
Fluid Temperature (C)
2 C to 220 C
Fluid Temperature (F)
36 F to 392 F
Maximum Differential Pressure Ratings (Close-off) (kPa)
Close off pressure with 1800N motor: 230kPa
Capacity (Kv)
160 Kvs
Valve Action
Stem up to close port A-AB
Valve Type
Three Port mixing valve
Controlled Fluid
Materials (Body)
Cast steel GS-C25
Materials (Seat)
Stainless Steel (replaceable)
Materials (Stem)
Stainless Steel
Flow Characteristic
Linear for ports A-AB and B-AB
Stem Travel (in.)
1-1/2 in.
Stem Travel (mm)
38 mm
Materials (Plug/Ball/Disc)
Plug: Stainless steel, skirt guided
Materials (Packing)
Spring-loaded PTFE cone rings
≤ 0.1% of kVS port A-AB, ≤ 0.1% of kVS port B-AB
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