Flowserve UNA 38 - Manual (Page 5)

5
Explanatory Notes
Scope of supply
UNA 38 with DUPLEX control unit
 Float trap UNA 38
 Installation manual
UNA 39 with DUPLEX control unit
 Foat trap UNA 39
 Installation manual
Retrofit set for UNA 38, UNA 39
 Control unit as per specification
 Installation manual
Spare parts
 Set according to spare parts list on page 8.
Description
UNA 3... are high-pressure steam traps with ball float and needle closing mechanism. The steam traps
work independently of back pressure, thus ensuring universal application.
The steam trap UNA 3… features a body with bolted cover and a control unit. Various control units
are available.
Level-dependent SIMPLEX control is particularly suitable for cold condensate and superheated steam.
Temperature-dependent DUPLEX control offers automatic deaeration by means of a bimetallic air vent
for saturated and superheated steam systems.
The orifice type O 80 MAX (UNA 38) is a control unit for large flowrates and high pressures, and can
be supplied as a SIMPLEX or DUPLEX version.
The orifice type O 40 MAX (UNA 39) is a SIMPLEX control unit for large flowrates and high pressures.
UNA 38 with SIMPLEX control unit
 Float trap UNA 38
 Hand vent valve with gasket, installed
 Float lifting lever with gasket, installed (optional)
 Installation manual
UNA 39 with SIMPLEX control unit
 Float trap UNA 39
 Hand vent valve with gasket, installed
 Float lifting lever with gasket, installed (optional)
 Installation manual
Function
UNA 38, UNA 39:
The ball valve of the control unit is operated by the float as a function of the condensate level in the
trap. The cross-sectional area (CSA) of the orifice (O) dictates the maximum flowrate when the valve is
completely open. The maximum admissible differential pressure of the control unit is a function of the
CSA of the orifice, the density of the fluid to be discharged, and the pressure/temperature ratings of the
body. Different closing units (orifices) are available.
Float traps equipped with DUPLEX control units enable automatic temperature-dependent deaeration
of saturated steam systems during start-up and in continuous operation.