Batescrew
Diverter Valves
     

Sealing relies on pressure differential between inlet and outlet.  The door has resilient rubber seals, which contact stainless seats in the branch pipes.
Diverters may be used instead of two gate valves, to reduce change-over time between lines, although this time advantage will be lost if excessive time is required to equalise pressure.
Made from  6mm material, in either mild steel, galvanised after fabrication, or stainless steel grades 304L or 316L.
Flanges may be fitted, as above, or plain spigots provided for welding or grouting.
The cost of flanges is not included in the standard price.  For choice of flanges, click here.  Details of modified Table D flanges are given with valve dimensions, see  Dimensions.
Mixed inlet and outlet sizes may be specified when ordering and, if welding the valve to a pipeline, spigots to match an existing pipe diameter may be ordered.
SEALS.   Seals of various thickness and hardness are used, to suit the maximum operating head to be encountered.  Please advise maximum head, when ordering.
CORROSION RESISTANCE.  Hot dip galvanising is the preferred finish for all valves within the standard size range.  If larger valves are made to order, it is necessary to check the availability of galvanising capacity.
Coal-tar and other epoxies may be used as alternatives to galvanising, or as additional protection after galvanising.
GEAR ACTUATORS.  Various types of gear and ratchet drive have been fitted to these valves, for better control of the door.  Our Technical Services Dept. can advise on the options available.

LIMITATIONS
WARNING.  Valves equipped with a hand lever. 
Do not change the flap position while a flow exists through the valve.  The flap will 'catch' in the flow and snap over rapidly, possibly causing injury and water-hammer.
WATER-HAMMER.  In some situations a pressure surge, of perhaps ten times the normal line pressure, can occur, when a flap is closed suddenly while a flow still exists through a valve.  This could be sufficient to rupture pipes or fittings.    This requires careful consideration when designing any system in which it is proposed to use a diverter valve. 
PRESSURE BYPASS.  It is usually necessary to equalise pressure between inlet and the closed line, before operating the valve.  This can be achieved by a bypass line and stop valve, preferably fitted at manufacture.  The size of a bypass will depend on the volume of water to be shifted.  This feature is an optional extra, size required needs to be advised when ordering. 

Standard Valve Sizes.       Nominal inlet bore  (mm).

300

450

600

750

900

1200

1500

 

 

Nominal Inlet Size (mm)

 

 

 

300

450

600

750

900

1200

1500

A

455

640

825

995

1175

1490

1700

B

12

16

20

20

20

25

25

D1

317

469

622

774

926

1231

1536

D2

317

469

622

774

926

1231

1536

D3

317

469

622

774

926

1231

1536

E

91

134

178

221

265

352

439

F

217

321

426

530

634

843

1052

G1

100

100

100

100

100

100

100

G2

100

100

100

100

100

100

100

G3

100

100

100

100

100

100

100

H

6

6

6

6

6

6

6

P

406

584

756

927

1092

1410

1615

Q

12

12

16

20

24

32

36

R

M20

M20

M20

M20

M25

M25

M25