SUPERSEDED by 257-000-020
255-438-020
- Monoflow and duoflow operation
- Self-supported rotating union
- Radial housing connection
- Balanced mechanical seals
- 3 vent holes
- Forged brass housing and stainless steel rotor
- Special options include threaded vent holes, low torque design
- Seal Combinations: Carbon Graphite/Bronze for water; Carbon Graphite/Ceramic for hot oil, hot water and saturated steam; Tungsten Carbide/Ceramic for severe conditions such as poor water quality
Dimensions
A
3/4"-14 NPT RH3/4"-14 NPT RH
B
3/4"-14 NPT3/4"-14 NPT
C
73.03 mm2.875 "
D1
145 mm5.709 "
E
37.6 mm1.48 "
F
22.8 mm0.898 "
G
17.5 mm0.689 "
H
32 mm1.26 "
J
104.4 mm4.11 "
K
1/2"-14 NPT1/2"-14 NPT
P
Non-ThreadedNon-Threaded
Operating Specifications
Media
WaterWater
Rotor Connection
3/4"-14 NPT RH 3/4"-14 NPT RH
Supply Connection
3/4"-14 NPT 3/4"-14 NPT
Water Max. Flow
52.8 l/min13.9 GPM
Water Max. Pressure
51.7 bar750 psi
Water Max. Temperature
121 °C250 °F
Documents & Resources
Installation Guide
Installation Guide for 54, 55, and 57 series
Interface Drawing
Interface Control drawing for 255-438-020
Operating Manual
Operating Manual for 54, 55, and 57 series
Service Guide
Service Guide for unions beginning with 55 to 655