non return valves and backflow preventers -...

Honeywell Braukmann Service Book107

RV 277 Non return valves 108




Non return valves –

What to do if... 116

R 295 DIN type 1 backflow preventers 118

R 295 H DIN type 2 backflow preventers 120

R 295 SA DIN type 2 backflow preventers 122

R 295 WA DIN type 2 backflow preventers 124

R 295 SB DIN type 3 backflow preventers 126

Non return valves and backflow preventers

DIN-type backflow preventers with flanges:

R 295-F DIN type 1 backflow preventers 128

R 295 H-F DIN type 2 backflow preventers 130

R 295 S-F DIN type 2 backflow preventers 132

R 295 W-F DIN type 2 backflow preventers 134

R 295 SB-FDIN type 3 backflow preventers 136

Backflow preventers –


BA 298 Backflow preventers 140

BA 298 I Backflow preventers 142

BA 298-F Backflow preventers 144

BA 298 I-F Backflow preventers 146

Backflow preventers –


107


RV 277 non return valves1994 and onwards


Description Nominal size Part number

a Seal ring set 1/2" + 3/4" 0901444(pack of 10) 1" 0901445

11/4" 090144611/2" 09014472" 0901448

b Blanking plug 1/2" – 2" S 06 M - 1/4with seal ring(pack of 5)

c Insert non-return 1/2" 2166200check valve 3/4" 2110200

1" 216440011/4" 216450011/2" 21646002" 2164700

RV 277 non return valves - Service parts1994 and onwards

Subject to change

a

c

b



a Disc guide 1/2" 55349003/4" 55351001 " 55315001 1/4" 55353001 1/2" 55355002 " 5535700

b Pressure spring 1/2" 20614003/4" 20615001 " 20616001 1/4" 20617001 1/2" 20620002 " 2062400

c Seal disc 1/2" 0900356complete 3/4" 0900357

1 " 09003581 1/4" 09003591 1/2" 09003602 " 0900361

d Blanking plug 1/2" – 2" S 06 M - 1/ 4

set with O-ring(pack of 5)


Subject to change

a

bc

d


b




a Disc guide 1/2" 5534900 3/4" 55351001 " 55315001 1/4" 55353001 1/2" 55355002 " 5535700

b Pressure spring 1/2" 20614003/4" 20615001 " 20616001 1/4" 20617001 1/2" 20620002 " 2062400

c Seal disc 1/2" 0900356complete 3/4" 0900357

1 " 09003581 1/4" 09003591 1/2" 09003602 " 0900361

d Blanking plug 1/2" – 2" S 06 M - 1/4set with O-ring(pack of 5)

e Seal ring 1/2" 53512003/4" 53513001 " 50181001 1/4" 59576001 1/2" 51630002 " 5163100


Subject to change vorbehalten

c

ab

ed



a Seal disc DN 40 5605800DN 50 5605900DN 65 0900376DN 80 0900377DN 100 0900378DN 125 0900379DN 150 0900380DN 200 0900381DN 250 0900382DN 300 0900383

b Lip seal ring DN 40 2238700(NBR) DN 50 2238800

DN 65 5350000DN 80 5350300DN 100 5350400DN 125 2070300DN 150 2067300DN 200 2238900DN 250 2239000DN 300 2239100

c Hexagonal DN 40 – 50 5726800blanking plug DN 65 – 100 2248700

DN 125 – 300 2591000

d Seal ring DN 40 – 50 2166600DN 65 – 100 5350500DN 125 – 300 2698000

e Hexagonal DN 40 – 50 2248600blanking plug DN 65 – 100 2248700

DN 125 – 300 2591000

f Seal ring DN 40 – 50 2221200DN 65 – 100 5350500DN 125 – 300 2698000


Subject to change

a

cd

e

b

f


Non return valves - What to do if…

– Shutoff valves before and/orafter non-return check valvenot fully open

– Valve disc sticking in guide

– Does not close properlyaround inlet

– Seal surfaces dirty or worn

– Air in pipework

– Valve closing very fast

– Loose and thereforevibrating valve discs inshutoff devices

– Air pockets in redundant orlittle used sections ofpipework

– Fast closing flushing valvesor other valves etc.

– Solenoid valves ondishwashing machines orwashing machines

– Non-return check valve isoversized

– Anti-vacuum valves or ventsfaulty

– Fully open shutoff valves

– Replace valve disc

– Exchange valve disc and lipseal

– Clean sealing components

and replace if necessary

– Check system

– If possible throttle closingspeed or replace if necessary

– Check shutoff devices and ifnecessary carry outmaintenance service on them

– Vent

– Check flushing valve andreplace if necessary

– Fit shock arrestor (e.g.Flamco) on the inlet to theappliances

– Consult Honeywell customersupport department

– Carry out maintenanceservice on devices

No, or too little flow

Problem Cause Solution

Pressure

Hammering noises


Accessories

ZT 295 A Soldered union connectors(2 pcs.)ZT 295 W - 1/2" (for 15mm Ø pipe)ZT 295 A - 3/ 4" (for 22mm Ø pipe)ZT 295 A - 1" (for 28mm Ø pipe)ZT 295 A - 11/4" (for 35mm Ø pipe)ZT 295 A - 11/2" (for 42mm Ø pipe)ZT 295 A - 2" (for 54mm Ø pipe)

M 07 Pressure gauge

Housing Ø 63 mm,rear connection G 1/4"Ranges:0 – 4, 0 – 10, 0 – 16, 0 – 25 bar.Please state pressure range whenordering

R 295 DIN type 1 backflow preventers1985 and onwards

bar

6

8

10

4

2

0

M 07ZT 295 A



a Valve insertcomplete0.5 bar 1/2" – 1" R 295 A - 3/4 A

11/4" – 2" R 295 A - 11/4 A

1.0 bar 1/2" – 1" R 295 A - 3/4 B11/4" – 2" R 295 A - 11/4 B

1.5 bar 1/2" – 1" R 295 A - 3/4 C11/4" – 2" R 295 A - 11/4 C

2.0 bar 1/2" – 1" R 295 A - 3/4 D11/4" – 2" R 295 A - 11/4 D

b Seal set 1/2" – 1" 090105511/4" – 2" 0901056

c Hexagonal 1/2" – 2" S 06 M - 1/4blanking plugwith seal ring(pack of 5)

d Seal ring 1/2" 53512003/4" 53513001" 516630011/4" 516290011/2" 51630002" 5163100

e Non return 1/2" RV 282 E - 3/4 Acheck valve 3/4" RV 282 E - 1 A

1" RV 282 E - 1 A11/4" RV 276 - 11/411/2" RV 276 - 11/22" RV 276 - 2

f Discharge 1/2" – 1" 0901340connector 11/4" – 2" 0901341complete

R 295 DIN type 1 backflow preventers - Service parts1985 and onwards

Subject to change

a

b

d

e

f

d

b

f

c


Accessories


M 07 Pressure gauge


5626200 Shock arrestorBottom connection, G 1/4"Outside Ø 85 mm

R 295 H DIN type 2 backflow preventers1989 and onwards

5626200

ZT 295 A

bar

6

8

10

4

2

0

M 07



a Valve insert 1/ 2" – 1" R 295 HA - 1 Acomplete 11/4" – 2" R 295 HA - 2 A

b Seal set 1/2" – 1" 090101511/4" – 2" 0901016

c Operating valve1/2" – 2" 2184100

d Hexagonal 1/2" – 2" S 06 M - 1/ 4

blanking plugwith seal ring(pack of 5)

e Seal ring 1/2" 53512003/4" 53513001" 516630011/4" 516290011/2" 51630002" 5163100

f Operating 1/2" R 295 HR - 1/2 Apressure 3/4" R 295 HR - 3/4 Asensor 1" R 295 HR - 3/4 A

11/4" R 295 HR - 11/4 A11/2" R 295 HR - 11/2 A2" R 295 HR - 2 A

g Discharge 1/2" – 1" 0901340connector 11/4" – 2" 0901341complete

R 295 H DIN type 2 backflow preventers - Service parts1989 and onwards

Subject to change

a

b

b

b

b

b

d

c

b

fe

b

b

g

e

g


Accessories

ZT 295 A Soldered union connectors(2 pcs.)

ZT 295 W - 1/ 2" (for 15mm Ø pipe)ZT 295 A - 3/ 4" (for 22mm Ø pipe)ZT 295 A - 1" (for 28mm Ø pipe)ZT 295 A - 11/4" (for 35mm Ø pipe)ZT 295 A - 11/2" (for 42mm Ø pipe)ZT 295 A - 2" (for 54mm Ø pipe)

M 07 Pressure gauge



R 295 SA DIN type 2 backflow preventers1989 and onwards

5626200

ZT 295 A

bar

6

8

10

4

2

0

M 07



a Valve insertcomplete0.5 bar 1/2" – 1" R 295 SAA - 1 A

11/4" – 2" R 295 SAA - 2 A

1.0 bar 1/2" – 1" R 295 SAA - 1 B11/4" – 2" R 295 SAA - 2 B

1.5 bar 1/2" – 1" R 295 SAA - 1 C11/4" – 2" R 295 SAA - 2 C

2.0 bar 1/2" – 1" R 295 SAA - 1 D11/4" – 2" R 295 SAA - 2 D

b Seal set 1/2" – 1" 090101511/4" – 2" 0901016

c Changeovervalve 1/2" – 2" 0901407

d Hexagonal 1/2" – 2" S 06 M - 1/4blanking plugwith seal ring(pack of 5)

e Seal ring 1/2" 53512003/4" 53513001" 516630011/4" 516290011/2" 51630002" 5163100

f Non return 1/2" RV 282 E - 3/ 4 Acheck valve 3/4" RV 282 E - 1 A

1" RV 282 E - 1 A11/4" RV 276 - 11/411/2" RV 276 - 11/22" RV 276 - 2


R 295 SA DIN type 2 backflow preventers - Service parts1989 and onwards

Subject to change

f

d

e

g

g

b

b

b

b

b

bb

e

a

bc


Accessories

ZT 295 W Soldered union connectors(2 pcs.)ZT 295 W - 1/2" (for 15mm Ø pipe)ZT 295 W - 3/4" (for 22mm Ø pipe)ZT 295 W - 1" (for 28mm Ø pipe)ZT 295 W - 11/4" (for 35mm Ø pipe)ZT 295 W - 11/2" (for 42mm Ø pipe)ZT 295 W - 2" (for 54mm Ø pipe)

M 07 Pressure gauge



R 295 WA DIN type 2 backflow preventers1989 and onwards

ZT 295 W

bar

6

8

10

4

2

0

M 07

5626200



a Valve insertcomplete0.5 bar 1/2" – 1" R 295 SAA - 1 A

11/4" – 2" R 295 SAA - 2 A

1.0 bar 1/2" – 1" R 295 SAA - 1 B11/4" – 2" R 295 SAA - 2 B

1.5 bar 1/2" – 1" R 295 SAA - 1 C11/4" – 2" R 295 SAA - 2 C

2.0 bar 1/2" – 1" R 295 SAA - 1 D11/4" – 2" R 295 SAA - 2 D

b Seal set 1/2" – 1" 090101511/4" – 2" 0901016

c Changeovervalve 1/2" – 2" 0901407


e Seal ring 1/2" 53512003/4" 53513001" 516630011/4" 516290011/2" 51630002" 5163100

f Non return 1/2" RV 282 E - 3/4 Acheck valve 3/4" RV 282 E - 1 A

1" RV 282 E - 1 A11/4" RV 276 - 11/4

11/2" RV 276 - 11/2

2" RV 276 - 2


h Proximityswitch 1/2" – 2" 2987800

i Pressureswitch 1/2" – 2" 5670500

R 295 WA DIN type 2 backflow preventers - Service parts1989 and onwards

Subject to change

d

b

cb

ba

e

g

f

h

b

b

e

g

i


Accessories


M 07 Pressure gauge

Housing Ø 63 mm,rear connection G 1/4".Ranges:0 – 4, 0 – 10, 0 – 16, 0 – 25 bar.Please state pressure range whenordering


R 295 SB DIN type 3 backflow preventers1989 and onwards

5626200

ZT 295 A

bar

6

8

10

4

2

0

M 07



a Valve insertcomplete0.5 bar 1/2" – 1" R 295 SBA - 1 A

11/4" – 2" R 295 SBA - 2 A

b Seal set 1/2" – 1" 090101511/4" – 2" 0901016

c Changeover 1/2" – 2" 0901407valve


e Seal ring 1/2" 53512003/4" 53513001" 516630011/4" 516290011/2" 51630002" 5163100

f Discharge 1/2" – 1" 0901340connector 11/4" – 2" 0901341complete

R 295 SB DIN type 3 backflow preventers - Service parts1989 and onwards

Subject to change

bc

ba

b

b

f

b

b

b

f

e

db

e


Accessories

M 15 Pressure gaugeHousing Ø 100 mm, rearconnection G 1/2"Ranges:0 – 4, 0 – 10, 0 – 16, 0 – 25 bar.Please state pressure range whenordering

W 15 ElbowGalvanised malleable iron, G 1/2"for M 15 pressure gauge

R 295-F DIN type 1 backflow preventers1987 and onwards

W 15 M 15



a Valve insertcomplete0.5 bar DN 65 R 295 A - 65 FA

DN 80 R 295 A - 80 FADN 100 R 295 A - 100 FADN 125 R 295 A - 125 FADN 150 R 295 A - 150 FADN 200 R 295 A - 200 FA

1.0 bar DN 65 R 295 A - 65 FBDN 80 R 295 A - 80 FBDN 100 R 295 A - 100 FBDN 125 R 295 A - 125 FBDN 150 R 295 A - 150 FBDN 200 R 295 A - 200 FB

1.5 bar DN 65 R 295 A - 65 FCDN 80 R 295 A - 80 FCDN 100 R 295 A - 100 FC

b Seal set DN 65 0901093DN 80 0901094DN 100 0901095DN 125 0901143DN 150 0901145DN 200 0901147

c Blanking plug DN 65with seal ring – 200 S 15 M - 1/ 2

(pack of 5)

d Lip seal ring DN 65 5350000DN 80 5350300DN 100 5350400DN 125 2070300DN 150 2067300DN 200 2238900

e Seal disc DN 65 0900376complete DN 80 0900377

DN 100 0900378DN 125 0900379DN 150 0900380DN 200 0900381

R 295-F DIN type 1 backflow preventers - Service parts1987 and onwards

Subject to change

a

b

c

d e

b

b b

b


Accessories

M 15 Pressure gauge

Housing Ø 100 mm, rearconnection G 1/2"Ranges:0 – 4, 0 – 10, 0 – 16, 0 – 25 bar.Please state pressure range whenordering

W 15 Elbow

Galvanised malleable iron, G 1/2"for M 15 pressure gauge

R 295 H-F DIN type 2 backflow preventers1989 and onwards

W 15 M 15



a Valve insertcomplete0.5 bar DN 65 R 295 A - 65 FB

DN 80 R 295 A - 80 FBDN 100 R 295 A - 100 FBDN 125 R 295 A - 125 FBDN 150 R 295 A - 150 FBDN 200 R 295 A - 200 FB


c Operating DN 65valve – 200 2184500

d Blanking plugwith seal ring DN 65(pack of 5) – 200 S 15 M - 1/ 2

e Pressure DN 65balancing valve – 200 R 295 H - F

f Lip seal ring DN 65 5350000DN 80 5350300DN 100 5350400DN 125 2070300DN 150 2067300DN 200 2238900

g Seal disc DN 65 0900376complete DN 80 0900377

DN 100 0900378DN 125 0900379DN 150 0900380

R 295 H-F DIN type 2 backflow preventers - Service parts1989 and onwards

Subject to change

a

c

d

e

b

b

b

b

f

g

b

b


Accessories

M 15 Pressure gauge

Housing Ø 100 mm, rearconnection G 1/2"Ranges:0 – 4, 0 – 10, 0 – 16, 0 – 25 bar.Please state pressure range whenordering

W 15 Elbow


R 295 S-F DIN type 2 backflow preventers1987 and onwards

W 15 M 15








c Changeover DN 65valve – 100 0901407

DN 125 – 200 0901412

d Blanking plug DN 65with seal ring – 200 S 15 M - 1/ 2

(pack of 5)

e Lip seal ring DN 65 5350000DN 80 5350300DN 100 5350400DN 125 2070300DN 150 2067300DN 200 2238900

f Seal disc DN 65 0900376complete DN 80 0900377

DN 100 0900378DN 125 0900379DN 150 0900380DN 200 0900381

R 295 S-F DIN type 2 backflow preventers - Service parts1987 and onwards

Subject to change

ef

a

b

c

b

b

d

b

b

b


Accessories


W 15 ElbowGalvanised malleable iron, G 1/2"for M 15 pressure gauge

R 295 W-F DIN type 2 backflow preventers1987 and onwards

W 15 M 15



a Valve insert DN 65 R 295 A - 65 FAcomplete DN 80 R 295 A - 80 FA0.5 bar DN 100 R 295 A - 100 FA

DN 125 R 295 A - 125 FADN 150 R 295 A - 150 FADN 200 R 295 A - 200 FA





DN 125 – 200 0901412

d Blanking plug DN 65with seal ring – 200 S 15 M - 1/2(pack of 5)

e Lip seal ring DN 65 5350000DN 80 5350300DN 100 5350400DN 125 2070300DN 150 2067300DN 200 2238900

f Seal disc DN 65 0900376complete DN 80 0900377

DN 100 0900378DN 125 0900379DN 150 0900380DN 200 0900381

g Proximity DN 65switch – 200 2987800

h Pressure switch DN 65 – 200 5670500

R 295 W-F DIN type 2 backflow preventers - Service parts1987 and onwards

Subject to change

a

b

b

b

b

b

d

g

e

h

f

b

c


Accessories


W 15 Elbow


R 295 SB-F DIN type 3 backflow preventers

W 15 M 15

1989 and onwards







DN 125 – 200 0901412

d Blanking plug DN 65with seal ring – 200 S 15 M - 1/ 2

(pack of 5)

R 295 SB-F DIN type 3 backflow preventers - Service parts1989 and onwards

Subject to change

a

bc

b

b

b

b

b

d


Backflow preventers - What to do if…

– Shutoff valves before and/orafter valve not fully open

– Filter in water meteringsystem dirty

– Valve cone in flow regulatingvalve blocked

– Pressure reducing valve notset to required value

– Filter dirty

– Backflow preventer fittedwrong way round

– Check supply pressure inrelation to set operatingpressure

– Faulty solenoid valve

– Operating valve switch doesnot operate because of dirt

– Control aperture of pressureswitch is dirty

– Leakage in the downstreamsystem

– Check supply pressure inrelation to set operatingpressure

– Operating pressure sensorleaking because of wear

– Operating valve leakingbecause of wear

– Proximity switch does notmaintain contact because ofwear

– Flow element stickingbecause of dirt

– Fully open shutoff valves

– Clean filter

– Carry out maintenance serviceon flow regulating valve

– Adjust pressure reducingvalve using ribbed knob

– Reverse rinse

– Fit device in correct flowdirection

– Consult Honeywell CustomerService department

– Replace solenoid valve

– Carry out maintenance serviceon operating valve

– Clean control aperture

– Check system

– Consult Honeywell CustomerService

– Carry out maintenance serviceon operating pressure sensoror replace

– Carry out maintenance serviceon operating valve or replace

– Replace proximity switch

– Clean and if necessaryreplace flow element

No, or too littlewater pressure

Valve does notswitch to flowposition

Valve opensand closesat short timeintervals(pumps)


general

general

R 295 SA

R 295 H

R 295 WA

general

R 295 H

R 295 H

R 295 WA

R 295 WA



– Fluted ring damaged bypressure shock or dirt

– Integral non-return checkvalve in the water meteringsystem is hammering

– Loose and therefore vibratingvalve disc in shutoff devices

– Air pocket in redundant orlittle used sections ofpipework

– Rapidly closing flushing valve

– Solenoid valves ondishwashing machine orwashing machine

– Replace fluted ring

– Remove or carry outmaintenance service on non-return check valve afterconsulation with watersupplier

– Check shutoff devices and ifnecessary carry outmaintenance service

– Vent

– Check flushing valve andreplace if necessary

– Fit shock arrestor (e.g.Flamco) on the flow to theappliance

Valve constantlydischarges

Hammeringnoises in theoutlet non-returncheck valve


general

general


Accessories

FY 30 StrainerWith double mesh strainer, brasshousingA = Mesh size approx. 0.35 mmB = Mesh size approx. 0.18 mm

FY 32 StrainerWith double mesh strainer, redbronze housingC = Mesh size approx. 0.25 mm

TK 298 Test kitElectronic pressure measuringmeter with digital indicator, in smartaluminium case, ideal for checkingand maintenance of all HoneywellBraukmann type BA backflowpreventers

BA 298 backflow preventers

FY 32

TK 298

FY 30

1993 and onwards



a Discharge valve 1/2" – 11/4" 090167111/2" – 2" 0901665

b Non return check 1/2" – 11/4" 0901669valve for inlet 11/2" – 2" 0901663

c Non return check 1/2" – 11/4" 0901670valve for outlet 11/2" – 2" 0901664

d Ball valve 1/2" – 2" 0901666

e Seal set 1/2" – 11/4" 090167411/2" – 2" 0901668

BA 298 backflow preventers - Service parts1993 and onwards

Subject to change

a

b

c

d

e

e

e


Accessories

TK 298 Test kit

Electronic pressure measuringmeter with digital indicator, in smartaluminium case, ideal for checkingand maintenance of all HoneywellBraukmann type BA backflowpreventers

BA 298 I backflow preventers1993 and onwards

TK 298



a Discharge valve 1/2" – 11/4" 090167111/2" – 2" 0901665

b Non return check 1/2" – 11/4" 0901669valve for inlet 11/2" – 2" 0901663

c Non return check1/2" – 11/4" 0901670valve for outlet 11/2" – 2" 0901664

d Ball valve 1/2" – 2" 0901667

e Seal set 1/2" – 11/4" 090167411/2" – 2" 0901668

BA 298 I backflow preventers - Service parts1993 and onwards

Subject to change

a

e

b

c

e

d

e


Accessories

FY 69 Y strainerWith double strainer mesh,grey cast iron housingA = Mesh size approx. 0.5 mm

WBA-298-100 Replacement tool for non-returncheck valveFor sizes DN 65 – 100

WBA-298-150 Replacement tool for non-returncheck valveFor size DN 150

TK 298 Test kitElectronic pressure measuringmeter with digital indicator, in smartaluminium case, ideal for checkingand maintenance of all HoneywellBraukmann type BA backflowpreventers

BA 298-F backflow preventers1993 and onwards

TK 298

WBA-298

FY 69



a Discharge valve DN 65 – 150 0901855DN 65 FB 0901665

b Non return check DN 65 – 100 0901650valve for inlet DN 150 0901654

DN 65 FB 0901663

c Non return check DN 65 – 100 0901651valve for outlet DN 150 0901655

DN 65 FB 0901664

d Ball valve DN 65 – 150 0901659

e Seal set DN 65 – 100 0901660DN 150 0901661DN 65 FB 0901668

BA 298-F backflow preventers - Service parts1993 and onwards

Subject to change

a

e

b

d

e

d

e

c

d


Accessories

WBA-298-100 Replacement tool for non-returncheck valve

For sizes DN 65 – 100

WBA-298-150 Replacement tool for non-returncheck valve

For size DN 150

TK 298 Test kit

Electronic pressure measuringmeter with digital indicator, in smartaluminium case, ideal for checkingand maintenance of all HoneywellBraukmann type BA backflowpreventers

BA 298 I-F backflow preventers1993 and onwards

TK 298

WBA-298



a Discharge valve DN 65 – 150 0901856DN 65 FB 0901665

b Non return check DN 65 – 100 0901652valve for inlet DN 150 0901656

DN 65 FB 0901663

c Non return check DN 65 – 100 0901653valve for outlet DN 150 0901657

DN 65 FB 0901664

d Ball valve DN 65 – 150 0901662

e Seal set DN 65 – 100 0901660DN 150 0901661DN 65 FB 0901668

BA 298 I-F backflow preventers - Service parts1993 and onwards

Subject to change

a

e

b

d

e

d

e

c

d



– Water hammer in watersupply network

– Fluctuating inlet pressure

– Inlet non return check valveor discharge valve are dirty

– Inlet non return check valvenot sealing properly

– Deposits on valve seat

– Damaged O-ring

– Discharge valve not sealingproperly

– Blocked control link pipe

– Inlet strainer is blocked

– Fit shock arrestor beforebackflow preventer

– Fit pressure reducing valvebefore backflow preventer

– Remove and clean nonreturn check valve and/ordischarge valve

– Remove non return checkvalve, clean and if necssaaryreplace

– Remove discharge valve,clean and if necessaryreplace

– Remove discharge valveand replace O-ring

– Remove discharge valve,clean and if necessaryreplace

– Remove control link pipe andclean

– Remove and clean strainer

Discharge valve opens for noapparent reason

Discharge valve does notclose

Discharge valve does notopen

Insufficient flow


non return valves and backflow preventers -...

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