Gormann-Rupp Pumps GRP33-07 Guida all'applicazione

GL‐00073‐03

July 15, 1986

Rev. T 06-30-20

GORMAN‐RUPP PUMPS

www.grpumps.com

e1986 Gorman‐Rupp Pumps Printed in U.S.A.

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

AUTOMATIC AIR RELEASE VALVES

MODELS

GRP33-07 GRP33-07A GRP33-07B GRP33-07C

GRP33-07D GRP33-07E GRP33-07F GRP33-07G

GRP33-07H GRP33-07J GRP33-07K GRP33-07L

GRP33-07M GRP33-07N GRP33-07P GRP33-07R

GRP33-07S GRP33-07T

Gorman‐Rupp pump online at

www.grpumps.com/register.

Valid serial number and e‐mail address required.

RECORD YOUR PUMP MODEL AND SERIAL NUMBER

Please record your pump model and serial number in the

spaces provided below. Your Gorman‐Rupp distributor

needs this information when you require parts or service.

Pump Model:

Serial Number:

TABLE OF CONTENTS

INTRODUCTION PAGE I - 1.................................................

SAFETY - SECTION A PAGE A - 1...........................................

INSTALLATION - SECTION B PAGE B - 1....................................

PREINSTALLATION INSPECTION PAGE B - 1............................................

AIR RELEASE VALVE INSTALLATION PAGE B - 1........................................

OPERATION - SECTION C PAGE C - 1......................................

THEORY OF OPERATION PAGE C - 1...................................................

ADJUSTMENT PAGE C - 2............................................................

LEAKAGE PAGE C - 2................................................................

TROUBLESHOOTING - SECTION D PAGE D - 1..............................

MAINTENANCE AND REPAIR - SECTION E PAGE E - 1.......................

AIR RELEASE VALVE CONSTRUCTION AND APPLICATION CHART PAGE E - 1.............

PARTS LISTS:

GRP33-07, 07A, 07B, 07J, 07K, 07M And 07P Air Release Valves PAGE E - 3...........

GRP33-07C, 07D, 07E And 07F Air Release Valves PAGE E - 5........................

GRP33-07G, 07H, 07L, 07N, 07R And 07T Air Release Valves PAGE E - 7...............

AIR RELEASE VALVE DISASSEMBLY AND REASSEMBLY PAGE E - 8......................

Air Release Valve Disassembly PAGE E - 9...........................................

Air Release Valve Reassembly PAGE E - 9...........................................

Lubrication PAGE E - 11............................................................

G‐R OM-00073

PAGE I - 1INTRODUCTION

INTRODUCTION

Thank You for purchasing a Gorman‐Rupp Auto

matic Air Release Valve. Read this manual careful

ly to learn how to safely install and operate your

pump. Failure to do so could result in personal inju

ry or damage to the pump.

Because pump installations are seldom identical,

this manual cannot possibly provide detailed in

structions and precautions for every aspect of

each specific application. Therefore, it is the re

sponsibility of the owner/installer of the pump to

ensure that applications not addressed in this

manual are performed only after establishing that

neither operator safety nor pump integrity are com

promised by the installation. Pumps and related

equipment must be installed and operated ac

cording to all national, local and industry stan

dards.

If there are any questions regarding the pump or

its application which are not covered in this man

ual or in other literature accompanying this unit,

please contact your Gorman‐Rupp distributor, or

The Gorman‐Rupp Company:

The Gorman‐Rupp Company

P.O. Box 1217

Mansfield, Ohio 44901-1217

Phone: (419) 755-1011

or:

Gorman‐Rupp of Canada Limited

70 Burwell Road

St. Thomas, Ontario N5P 3R7

Phone: (519) 631-2870

HAZARD AND INSTRUCTION

DEFINITIONS

The following are used to alert maintenance per

sonnel to procedures which require special atten

tion, to those which could damage equipment, and

to those which could be dangerous to personnel:

Immediate hazards which WILL result in

severe personal injury or death. These

instructions describe the procedure re

quired and the injury which will result

from failure to follow the procedure.

Hazards or unsafe practices which

COULD result in severe personal injury

or death. These instructions describe

the procedure required and the injury

which could result from failure to follow

the procedure.

Hazards or unsafe practices which COULD

result in minor personal injury or product

or property damage. These instructions

describe the requirements and the possi

ble damage which could result from failure

to follow the procedure.

NOTE

Instructions to aid in installation, operation, and

maintenance or which clarify a procedure.

G‐R GL-00073

PAGE A - 1SAFETY

SAFETY - SECTION A

This information applies to Gorman‐

Rupp Automatic Air Release Valves. Re

fer to the manual accompanying the

pump and power source before at

tempting to begin operation.

Because pump installations are seldom

identical, this manual cannot possibly

provide detailed instructions and pre

cautions for each specific application.

Therefore, it is the owner/installer's re

sponsibility to ensure that applications

not addressed in this manual are per

formed only after establishing that nei

ther operator safety nor pump integrity

are compromised by the installation.

Before installing the Automatic Air Re

lease Valve, check the chemical com

patibility of the valve components with

the liquid being pumped. For applica

tions involving volatile, flammable or

corrosive liquids, use a stainless steel

valve fitted with an optional fluorocar

bon (DuPont Vitonror equivalent) dia

phragm (see the Parts Lists in Section

E). Misapplication of materials could re

sult in damage to the valve and/or dan

ger to personnel as a result of valve fail

ure.

Before attempting to service the Air Re

lease Valve:

1. Familiarize yourself with this man

ual.

2. Disconnect or lock out the power

source to ensure that the pump will

remain inoperative.

3. Allow the pump and liquid to com

pletely cool if overheated.

4. Check the temperature before

opening any covers, plates, or

plugs.

5. Close the suction and discharge

valves.

6. Vent the pump slowly and cau

tiously.

7. Drain the pump.

If the application involves volatile, cor

rosive or hazardous liquids, wear pro

tective safety equipment, such as

goggles, rubber gloves and apron when

servicing the pump or Automatic Air Re

lease Valve.

If the application involves petroleum

products such as fuel oil or gasoline,

provide adequate ventilation, prohibit

smoking, and wear static‐resistant

clothing and shoes before servicing the

Automatic Air Release Valve. Clean up

all fuel spills immediately after occur

ence.

Some leakage (1 to 5 gallons[3,8 to 19 li

ters] per minute) will occur when the

valve is fully closed. Be sure the bleeder

line is directed back to the wet well or

tank to prevent hazardous spills.

Do not use fingers to move the plunger

rod or to check spring compression

while the pump is operating. Sudden re

lease of spring tension could pinch fin

gers or seriously injure personnel.

GL-00073G‐R

PAGE B - 1INSTALLATION

INSTALLATION - SECTION B

Review all SAFETY information in Section A.

Since pump installations are seldom identical, this

section offers only general recommendations and

practices required to inspect and install the Auto

matic Air Release Valve. Refer to the literature ac

companying the pump or contact the factory for

specific pump installation instructions. Refer to

MAINTENANCE AND REPAIR, Section E in this

manual for disassembly and reassembly of the Au

tomatic Air Release Valve.

PREINSTALLATION INSPECTION

The Automatic Air Release Valve was fully as

sembled and inspected before shipment from the

factory. Before installation, inspect the valve for

damage which may have occurred during ship

ment. Check as follows:

a. Inspect the valve for cracks, dents, damaged

threads, and other obvious damage.

b. Check for and tighten loose attaching hard

ware at mating surfaces.

c. Check the plunger rod for free movement by

compressing the spring with an appropriate

tool. Note the color code on the spring for fu

ture reference.

d. If the valve has been in stock for over 1 year,

re‐lubricate the shaft as indicated in LU

BRICATION, Section E.

AIR RELEASE VALVE INSTALLATION

The Automatic Air Release Valve must be inde

pendently mounted in a horizontal position and

connected to the discharge line of the self‐priming

centrifugal pump (see Figure B-1).

NOTE

If the Air Release Valve is to be installed on a staged

pump application, contact the factory for specific

installation instructions.

DISCHARGE PIPE

DISCHARGE

CHECK VALVE

PUMP DISCHARGE

SELF‐PRIMING

CENTRIFUGAL

PUMP

SUCTION

LINE

SUPPORT

BRACKET

CLEAN‐OUT

COVER

INSTALL AIR RELEASE VALVE

IN HORIZONTAL POSITION

90_LONG

RADIUS

ELBOW

WET WELL

OR SUMP

BLEED LINE 1”

(25,4 MM) DIA. MIN.

(CUSTOMER FUR

NISHED) DO NOT EX

TEND BELOW PUMP

OFF LIQUID LEVEL

Figure B-1. Typical Automatic Air Release Valve Installation

GL-00073 G‐R

PAGE B - 2 INSTALLATION

The valve inlet line must be installed between the

pump discharge port and the non‐pressurized side

of the discharge check valve. The valve inlet is at

the large end of the valve body, and is provided

with standard 1‐inch NPT pipe threads.

The valve outlet is located at the opposite end of

the valve, and is also equipped with standard

1‐inch NPT pipe threads. The outlet should be con

nected to a bleed line which slopes back to the wet

well or sump. The bleed line must be the same size

as the inlet piping, or larger. If piping is used for the

bleed line, avoid the use of elbows whenever pos

sible.

NOTE

It is recommended that each Air Release Valve be

fitted with an independent bleeder line directed

back to the wet well. If multiple Air Release Valves

are installed in a system, they must be fitted with in

dependent bleeder lines; never use a common

manifold pipe. Contact your Gorman‐Rupp dis

tributor or the Gorman‐Rupp Company for informa

tion about installation of an Automatic Air Release

Valve for your specific application.

If the liquid to be pumped contains large entrained

solids, grease or other substances likely to cause

clogging, use smooth‐bore hose at least one size

larger than the outlet. Air and liquid vented during

the priming process will agitate the hose, loosen

ing any build‐up, greatly reducing the chance of

clogging.

A bypass line returned to a wet well could

be drawn into the pump suction inlet,

which could result in damage to the sys

tem. Secure the bypass line to prevent this

from occurring.

It is recommended that pipe unions be installed at

the valve inlet, and at each 90_elbow to ease dis

assembly and maintenance. A shut‐off valve may

be installed before the valve inlet to allow the Air

Release Valve to be removed for service while the

pump remains in operation.

If the Air Release Valve is installed on a

pump with a flooded suction (such as a

below ground lift station), a pipe union and

shut‐off valve must be installed in the

bleed line to eliminate the possibility of

flooding the station while servicing the Air

Release Valve.

If a manual shut‐off valve is installed anywhere in

the air release piping, it must be a full‐opening,

ball‐type valve to prevent plugging by solids.

Any shut‐off valve installed in a bypass

line must not be left closed during oper

ation. A closed manual shut‐off valve

may cause a pump which has lost prime

to continue to operate without reaching

prime, causing dangerous overheating

and possible explosive rupture of the

pump casing. Personnel could be se

verely injured.

Allow an over‐heated pump to com

pletely cool before servicing. Do not re

move plates, covers, gauges, or fittings

from an over‐heated pump. Liquid with

in the pump can reach boiling tempera

tures, and vapor pressure within the

pump can cause parts being disen

gaged to be ejected with great force. Af

ter the pump cools, drain the liquid from

the pump by removing the casing drain

plug. Use caution when removing the

plug to prevent injury to personnel from

hot liquid.

G‐R GL-00073

OPERATION PAGE C - 1

OPERATION - SECTION C

THEORY OF OPERATION

Review all SAFETY information in Section A.

A self‐priming centrifugal pump will not prime if

there is sufficient static liquid head to hold the dis

charge check valve closed. Self‐priming pumps

are not air compressors. During the priming cycle,

air from the suction line must be vented to atmos

phere on the discharge side. It is therefore neces

sary to open the discharge side of the pump to at

mospheric pressure and allow the air to bleed off

during ther priming cycle. If the bleed line is not

closed after the pump is primed, liquid would be

forced back to the wet well under the full working

pressure of the pump. This wasteful recirculation of

liquid is controlled by the Automatic Air Release

Valve.

When properly installed and correctly adjusted to

the specific hydraulic operating conditions, the Au

tomatic Air Release Valve will permit air to escape,

and will close automatically when the pump is fully

primed and pumping at full capacity.

Figures C-1 and C-2 show a cross‐sectional view

of the valve, and a corresponding description of

operation.

Air from the pump casing passes through the valve

to the wet well during the priming cycle (Figure

C-1).

Figure C-1. Valve in Open Position

When the pump is fully primed, pressure resulting

from flow against the valve diaphragm com

presses the spring and closes the valve (Figure

C-2). The valve will remain closed, reducing the

bypass of liquid to 1 to 5 gallons (3,8 to 19 liters) per

minute, until the pump loses its prime or stops.

Some leakage (1 to 5 gallons [3,8 to 19

liters] per minute) will occur when the

valve is fully closed. Be sure the bypass

line is directed back to the wet well or

tank to prevent hazardous spills.

Figure C-2. Valve in Closed Position

When the pump shuts down, the spring returns the

diaphragm to its original position. Any solids that

may have accumulated in the diaphragm chamber

settle to the bottom and are flushed out during the

next priming cycle.

NOTE

The valve will remain open until the total dynamic

discharge head exceeds the static discharge head.

The range of the valve closing pressure is estab

lished by the tension rate of the spring as ordered

from the factory. Valve closing pressure can be fur

ther adjusted to satisfy system requirements by

moving the spring retaining pin up or down the

plunger rod to increase or decrease tension on the

spring. Contact your Gorman‐Rupp distributor or

the Gorman‐Rupp Company for additional informa

tion.

G‐RGL-00073

OPERATIONPAGE C - 2

AIR RELEASE VALVE CONSTRUCTION

AND APPLICATION DATA

Refer to the table on page E-1 for Air Release

Valve Construction and Application Data

ADJUSTMENT

The valve closing pressure within the ranges indi

cated in Table E-1 can be adjusted by increasing

or decreasing the spring tension on the plunger

shaft while the Air Release Valve is in the Open

position. This can be accomplished by moving the

pin in the spring centering washer either up or

down the plunger rod. Five holes are provided for

adjusting the spring tension. An optional spring

compression tool, G‐R part number 48781-003,

will ease spring adjustment.

Do not use fingers to move the plunger

rod or to check spring compression

while the pump is operating. Sudden re

lease of spring tension could pinch fin

gers or seriously injure personnel.

With the pin located in the hole nearest the dia

phragm, the valve will close at the minimum dis

charge head (pressure) for that particular spring.

With the pin located in the hole farthest from the di

aphragm, the valve will close at the maximum dis

charge head (pressure) for that spring. Adjust

ment is correct when the valve closes as the dis

charge check valve opens during pumping. The

valve will stay closed during the pumping cycle un

less the pump loses its prime.

Depending on the frequency of operation and the

initial spring tension, the valve plunger may even

tually stick or operate erratically. If this occurs, re

move the inspection plate on the valve cover and

check for debris that may be clogging the dia

phragm. Refer to Lubrication in MAINTENCNCE

AND REPAIR.

LEAKAGE

All Automatic Air Release Valves have a slight index

channel machined into the end of the plunger rod.

This index acts as a pressure relief to prevent the

valve from becoming hydraulically locked when

the pump is shut down. This happens most often in

a closed system where the Air Release Valve is iso

lated in the piping system by suction and dis

charge flap valves.

The pressure relief index releases the plunger rod

by allowing liquid to drain out of the valve and back

to the wet well during shutdown. As a result, some

leakage (1 to 5 gallons [3,8 to 19 liters] per minute)

will occur during both priming and pump opera

tion. If greater leakage occurs, the valve may not

be completely closing (see ADJUSTMENT in this

section).

G‐R GL-00073

TROUBLESHOOTING PAGE D - 1

TROUBLESHOOTING - SECTION D

Review all SAFETY information in Section A.

Before attempting to service the Air Re

lease Valve:

1. Familiarize yourself with this manual.

2. Lock out or disconnect the power

source to ensure that the pump will

remain inoperative.

3. Allow the pump to completely cool if

overheated.

4. Check the temperature before open

ing any covers, plates, or plugs.

5. Close the suction and discharge

valves.

6. Vent the pump slowly and cautiously.

7. Drain the pump.

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY

VALVE FAILS

TO CLOSE

Inlet line to valve clogged. Clean inlet line.

Spring tension incorrect. Select spring and/or adjust tension

based on discharge head condi

tions (see Table E-1).

Pump not producing designed flow ca

pacity or discharge head.

Operate pump at designed

speed. Refer to literature accom

panying pump.

Plunger rod movement restricted by

debris.

Disassemble and clean valve.

Plunger rod needs lubrication. Lubricate rod as indicated in

LUBRICATION, Section E.

VALVE BODY

LEAKS

Rubber diaphragm loose or damaged. Tighten hardware at body flange or

replace diaphragm.

Worn lip seal or leaking O‐ring. Replace worn parts.

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