Flowserve UNA 14 - Manual (Page 10)

10
Explanatory Notes
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Description
UNA 14, UNA 16, UNA 16 A, UNA 14 P are steam/air traps with ball float and rolling ball valve. The
steam traps can be used for all operating conditions, as they are unaffected by back pressure. They
consist of a body with bolted cover and a control unit. The control unit is freely accessible after
removing the cover. It can be completely replaced without having to remove the valve body from the
line. A conversion of “h” design to “v” design or vice versa is possible without any problem by
repositioning body and control unit. The direction of flow is indicated by an arrow, the position of
installation by the word “Top” on the name plate.
■ suitable for large condensate flowrates
■ “h”-design for horizontal lines
■ “v”-design for vertical lines
(To convert “h” to “v” design or vice versa turn cover and control unit respectively)
UNA 14, UNA 16, UNA 16 A
Three different control units are available: Control unit “SIMPLEX”: level-dependent float control
particularly suitable for cold condensate. Control unit “SIMPLEX R”: level-dependent float control
with internal vent pipe for continuous air-venting. Control unit “DUPLEX”: float control with
temperature-dependent automatic air-venting of saturated steam systems.
UNA 14 P
The air trap is suitable for draining compressed air and gas systems. Two different control units are
available: Control unit “SIMPLEX” with steel valve ball or control unit “SIMPLEX P” with Perbunan
®
valve ball. The air traps feature as standard a manual purging device (float-lifting lever) and a 3 /
8
"
BSP connection (with plug) for subsequent fitting of an air-balance pipe.
As the condensate flows into the steam trap it operates the float, which in turn opens the rolling ball
valve of the control unit, and in doing so uncovers the discharge passage. The cross-sectional area
of the orifice dictates the max. flowrate when the discharge passage is completely open. The max.
allowable differential pressure of the control unit used depends on the cross-sectional area of the
orifice and the density of the fluid to be discharged.
Three different orifices are available (retrofitting possible).
Float-operated steam traps equipped with control units DUPLEX enable automatic temperature-
dependent deaeration of saturated steam systems at start-up and during continuous operation.
The air trap UNA 14P features an orifice as standard which is rated for a max. differential pressure of
up to 16 bar and a liquid density of
ρ
= 1000 kg/m 3 . Note that lower densities reduce the max.
service range accordingly.
The flowrates are indicated in the capacity charts. Air traps for other pressure ratings are available
on request.
Function
Perbunan ® is a registered trademark of Bayer AG, Leverkusen