Specification Data

B

Sec. 10

AUTOMATIC AIR RELEASE VALVE

PAGE 1490

NOVEMBER 2012

VALVE SPECIFICATIONS

Size: 3/8” x 3/4” (9,6 mm x 19 mm) NPT ‐ Female.

Air Valve: Gray Iron.

Float Chamber: Ductile Iron.

Floats: Rubber.

Linkage: Stainless Steel.

Valve Seat: Stainless Steel.

O‐ring: Buna‐N.

Hardware: Standard Plated Steel.

VALVE

SEAT

Model GRP33‐06A

Size 3/8” x 3/4”

FOR GAS

RELEASE VENT LINE

(TO OUTSIDE)

AIR VALVE

MOUNTING

FOOT

FLOAT ROD

FOR LINE FROM PUMP

GROUP GRIND

FLOATS

FLOAT

CHAMBER

SUMP

VALVE

FOR LINE FROM

PUMP SUCTION

TYPICAL INSTALLATION AND THEORY OF OPERATION

The Air Release Valve is designed with an air valve in the head of the assembly and a sump valve in the base. These valves are controlled by a common rod that is moved vertically by an attached set of floats.

VENT TO OUTSIDE IF INSTALLED

IN PUMP HOUSE (CHECK VALVE

REQUIRED ON DUPLEX

INSTALLATION ONLY)

DISCHARGE LINE CHECK

VALVE (MANDATORY)

DISCHARGE

LINE

AIR RELEASE VALVE

When the pump “A” is started, air is drawn from the suction line into the priming pump and directed through the discharge tube “B” to the Air Release Valve. This air and vapor is then vented to atmosphere through the valve head.

With the float down, sump valve “E” is closed; air cannot re‐enter the suction pip­ ing through the return tube assembly “C”.

As product fills the pump casing, pressure develops, opening the check valve “D” in the discharge piping. The priming pump delivers product and fills the float cham­ ber, causing the float to rise, which opens the sump valve “E” and closes the air valve.

SUCTION LINE

GORMAN‐RUPP SELF‐PRIMING

CENTRIFUGAL PUMP

The product recirculates through the return tube assembly “C” to the pump suction. The liquid pressure equalizes the priming pump spring pressure and the priming pump slides into neutral. At this point, the pump is fully primed.

In the neutral position, the priming pump circulates a small amount of liquid through the discharge tube to the float chamber and back to the pump suction through the return tube.

If air or vapor enters the suction piping during the pumping operation, the discharge line check valve closes again and the priming pump again evacuates the air through the Air Release Valve.

THE GORMAN‐RUPP COMPANY

D

MANSFIELD, OHIO

GORMAN‐RUPP OF CANADA LIMITED

D

ST. THOMAS, ONTARIO, CANADA www.grpumps.com

Specifications Subject to Change Without Notice

E

Copyright by the Gorman‐Rupp Company 2012

Printed in U.S.A.

Specification Data

SECTION 10, PAGE 1490

OVERALL DIMENSIONS and

WEIGHTS APPROXIMATE

NET WEIGHT: 40 LBS. [18,1 KG.]

SHIPPING WEIGHTS: 45 LBS. [20,4 KG.]

CARTON: 2.5 CU. FT. [0,07 CU. M.]

FOOTPRINT

DIMENSIONS:

INCHES

[MILLIMETERS]

THE GORMAN‐RUPP COMPANY

D

MANSFIELD, OHIO

GORMAN‐RUPP OF CANADA LIMITED

D

ST. THOMAS, ONTARIO, CANADA

E

Copyright by the Gorman‐Rupp Company 2012

Printed in U.S.A.