Gerald O Walraven

Address:

PO Box 9257, Green Bay, WI 54308

Phone:

9204650990

VIN:

1G4HP572X7U202930

Make:

BUICK

Model:

LUCERNE

Year:

2007

US Patent:

57251045, Mar 10, 1998

Filed:

Sep 6, 1996

Appl. No.:

8/711959

Inventors:

Gerald O. Walraven - Sturgeon Bay WI

International Classification:

B04C 514
F16K 3144

US Classification:

209733

Abstract:

An improved dump valve construction for a high density cellulosic pulp cleaner. The cleaner comprises an upper separating chamber and a lower reject chamber which communicates with the lower end of the separating chamber. Cellulosic pulp is pumped tangentially into the upper end of the separation chamber and is swirled within the separation chamber to cause the high density contaminants to fall into the reject chamber while the pulp is discharged through an outlet in the upper end of the separation chamber. The opening between the lower end of the separation chamber and the reject chamber can be opened and closed by a sliding upper valve while the lower end of the reject chamber is formed with an outlet and the flow through the outlet is controlled by a dump valve having a curved or spherical outer surface which seats on an annular valve seat bordering the outlet. The dump valve is moved between a closed and opened position by a fluid cylinder unit and the piston rod of the fluid cylinder unit is connected to the stem of the dump valve through a lost-motion connection.

US Patent:

54178096, May 23, 1995

Filed:

Aug 31, 1994

Appl. No.:

8/298198

Inventors:

Roger P. Hoffman - Green Bay WI
Gerald O. Walraven - Sturgeon Bay WI

Assignee:

Hoffman Environmental Systems, Inc. - Green Bay WI

International Classification:

D21F 166
D21F 148
D21F 176

US Classification:

162190

Abstract:

A papermaking water system utilizing vacuum pump sealing water and having a zero sealing water discharge. A group of water seal vacuum pumps are used in a papermaking machine to generate subatmospheric pressure in suction equipment and thereby extract water from a wet paper web. During operation of the vacuum pumps, the sealing water is heated and the heated water is discharged to a cooling tower to cool the water which is then recirculated to the vacuum pumps. Steam from a generating plant is supplied to the dryer drums in the dryer section of the papermaking machine, and the steam condensate is combined with the heated sealing water flowing to the cooling tower. By using steam condensate as makeup water, no ionic buildup will occur in the closed system, and high quality water is withdrawn from the closed system and may be used in other sections of the papermaking machine, so that there is no discharge of sealing water to the sewer system.