F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/7
F16K 11/02 (2006.01) D21F 3/02 (2006.01) D21F 7/00 (2006.01) F16K 11/044 (2006.01)
Patent
CA 1285193
CONTROL VALVE FOR A STEAM BOX ABSTRACT OF THE DISCLOSURE A control valve (22) is disclosed for controlling both the flow of steam (5) from a steam header (18) and air (A) into a steam box (12) of a web drying machine. The control valve (22) includes a valve body (26) defining a longitudinal passageway (28). The passageway (28) has a first and a second end (30,32) with the first end (30) of the passageway (28) being connected to, and in fluid communication with, the steam header (18). The second end (32) is connected to and in fluid communication with an air header (19). A first and a second valve seat (34,36) are disposed adjacent to the first and the second ends (30,32) of the passageway (28) for controlling re- spectively the flow of steam (S) and air (A) into the steam box (12). An elongate valve stem (38) having a first and a second valve closure (44,46) is movable axially within and along the passageway (28), the first and second closures (44,46) being disposed adjacent to a first and second end (40,42) of the valve stem (38). A stepping motor (48) is drivingly connected to the valve stem (38) for selectively moving the valve stem (38) axially relative to the passage- way (28) such that when the valve stem (38) is moved, the change in flow of steam (S), into the steam box (12) is inversely proportional to the change in flow of air (A) through the second valve seat (36).
526623
Orange Robert J.
Wywialowski Frank J.
Metso Paper Inc.
Mitsubishi Heavy Industries Ltd.
Ridout & Maybee Llp
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