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Ball Type Check Valves

Normex Standard Ball NRV B - 01 

 

Check  Valve - Ball type (non-return valve) was the first valves at Normex with a unique design. A very simple but robust design with no critical mechanism involved. All parts like  hinge-pin-disc mechanism used in conventional valve are eliminated, and Normex has put in a reinforced rubber coated ball to arrest flow media in return condition. This ball, moves totally out of the flow path when the pumping is on to give minimum head losses. The spherical rubber coated ball seals perfectly on the rounded valve seat ensuring a totally leak proof sealing. This design offers other advantages like non-clogging & self cleaning. In this virtually maintenance free valves, if required, after prolonged usage, the on-line replacement of the ball is just a minute job.

 

Ball Type Check Valves

n Lower power consumption

n Larger solid handling capacity

n Self cleaning, Non-Clogging

n Perfect Sealing

n Low pressure drop

 
   
Ball Check Valves ( Flanged ) - Model B - 01
   
Ball Check Valves ( Flanged )
  • Materials :
    Body & Cover: CI (GG25)
    Ball : Nitrile rubber coated
    Seat : Leaded Tin Bronze
  • Other materials on request
  • Sizes : 25 to 350 NB
  • Pressure rating : 25 to 125 NB: PN1.6
    150 to 300 NB: PN 1.0
    350 NB : PN 0.6
    ( For CI Construction. )

    Installation : Vertical / Horizontal
 

 

 

Normex Ball Non Return Valves

 

Normex Ball Non Return Valves

Principle:

The heart of this valve is a reinforced rubber ball. The unique design of the valve allows free movement of the ball. The ball moves to open position when the pump starts & allows free flow of liquid without any interference (See Fig.). As the pump stops, the ball seats firmly against the metal seat due to its own weight & back pressure of the liquid (Mouse over fig.). This results in DROPLESS sealing.

 

 

n Dimensionally compatible with IS 5312 (Face to Face)

n Can be installed vertically or horizontally

n Operates silently

n Operates at temp 80 C continuously

  (for 100 C application please contact us.)

 

Part List / Materials of Construction

Part

Description

Standard

Special

1.

Body

Cast Iron

St. Steel, Cast Steel

2.

Cover

Cast Iron

St. Steel, Cast Steel

3.

Ball

Nitrile Reinforced

EPDM, Neoprene

4.

Cover Ring

Nitrile Rubber

Butyle, Viton

5.

Ball Seat Ring

L. T. Bronze

St. Steel, Hard Rub.

6.

Fasteners

Carbon Steel

St. Steel

 

 

 

 

Normex Ball Non Return Valves

 

 

 

 

 

 

 

 

 

 

Dimensions (A = Valve size in mm)

A

25

40

50

65

80

100

125

150

200

250

300

350

D

115

150

165

185

200

220

250

285

340

395

445

527

L

144

174

200

240

260

300

350

400

500

600

700

800

H

115

160

180

210

230

280

340

400

500

570

680

800

T

15

15

16

16

19

20

21

21

22

24

25

29

 

Pressure rating

Size  25 - 125 mm = PN 16

Body test : 1.5 times rated Pressure

Seat test  : 1.1 times rated Pressure

 

 

Comparison

 

 

Normex check valve - Ball type

Conventional

non - return valve

1. Head Loss (Pressure Drop)

Ball Type Check Valves

Low, Due to light, free flowing rubber ball, without causing any interference, resulting in lower power consumption (frictionless)

 

Conventional Non Return Valve

 

High, Due to interference of the heavy hinge/disc mechanism, with the flow resulting in high power consumption.

2. Perfect Sealing

 

Ball Type Check Valves

The sealing face is deposit free, since it remains inclined in any position of the valve, ensuring perfect sealing. (Drop less)

 

 

Conventional Non Return Valve

Deposits on the sealing due to its flatness may not ensure perfect sealing.

 

3. Solid Handling Capacity

Clear passage, equal to nominal valve dia. gives larger solid handling capacity

The above interference leaves a clear passage less than the normal valve dia., hence smaller solid handling capacity

4. Self Cleaning

Any deposits formed on the ball and in the valve passage are removed due to the rolling of the ball in operation.

No such possibility

5.

Non-Clogging Nature

No moving parts other than the free moving ball, hence no jamming/clogging.

Moving parts may jam due to deposits.

6. Applications

Unlimited. Ideal for slurries, sewage, viscous, erosive & corrosive liquids.

Limited. Troublesome for slurries, sewage & viscous liquids.

7. Maintenance

Abrasion resistance of rubber ensures longer life. Also the cleanout port does not necessitate valve removal from the pipeline. Hence much shorter downtime.

Parts may wear out due to abrasion. Also, valve may be removed from the pipeline for maintenance/ cleaning. Hence longer down time.

 

Normex Rubber lined /FRP lined NRV B - 02

 

Normex Rubber lined /FRP lined NRV B - 02

This ball check valve can be offered with inside lining of Rubber / FRP with all its advantages. The lining of Ebonite hard, Neoprene, Butyle etc., can also be offered depending on chemicals / abrasives handled.

This is the best valve for abrasives / chemicals.

 

The overall dimension of this valve will be similar to standard check valve, but face to face length will be more by 6 - 10 mm

Size 25 350 mm

 
   
Rubber Lined Ball Check Valves - Model B - 02
   
Rubber Lined Ball Check Valve

These valves are lined internally with rubber so that media does not come in
contact with metal. Most suitable for corrosive/erosive applications.

  • Materials : Body & Cover: CI(GG25)
    Ball: Nitrile rubber coated
    Seat: Integral
    Lining: Ebonite Hard
  • Sizes : 25 to 350 NB
  • Pressure rating :    25 t0 125NB : PN 1.6
      150 to 300 NB : PN 1.0     
      350 NB : PNO.6 (For CI Construction.)

      Installatlon : Vertical / HOrizontal
 

 

Normex Low Pressure check valve (Threaded) B - 06

 

Normex Low Pressure check valve (Threaded) B - 06

Low pressure check valve is having both ends threaded & has got all the advantages of standard ball check valve. This valve works vertically or horizontally.

 

Sizes : 25 100 mm working pressure

6 kg/cm2

 

Sizes : 100, 125 & 150 mm available in flanged top & bottom

 
   
Ball Check valves ( Threaded ) - Model B - 06
   
Ball Check valves ( Threaded )
  • Materials : Body : CI(GG24)
    Ball : Nitrile rubber coated
    Seat : Nitrile
  • Other materials on request
  • Sizes : 25 to 100 NB
  • Pressure rating : PNO.6
    (For CI Construction.)

    Installation: Vertical/ Horizontal/Inclined
   
 

 

Normex Low Pressure check valve (Threaded) B - 06

Part List / Materials of Construction

Part

Description

Material

1.

Body

Cast Iron

2.

Strainer

Cast Iron

3.

Ball

Nitrile Rubber

4.

Seal Ring

Nitrile Rubber

5.

Fastener

Carbon Steel

6.

Adaptor

Cast Iron

 

 

 

 

 

 

 

 

 

 

Dimensions ( Valve size in mm)

Size(A)

25

40

50

65

80

100

H

100

135

165

200

244

284

W

90

125

148

190

232

275

  

Pressure rating = PN 6

 

 

 

Technical Comparison

 

CHECK VALVE - BALL TYPE

&

CONVENTIONALLLY USED FLAP TYPE

Normex Ball type B-01

Conventional Flap type

Innovative design, focused to eliminate all constraints of conventional one and offer optimum performance

Conventional design carries lot of constraints.

Internals designed in such a way that laminar flow is not disturbed to a large extent.

Turbulance is generated in fluid flow due to design limitations.

Very low pressure drop acros the valve which saves energy, reduces pump cycle time duration

Comparatively high pressure losses, requires more energy increases pump cycle time duration.

Opening & closing mechanism is by way to free flowing rubber coated ball hence eliminated hing-pin-disc failure.

Opening & closing mechanism involves hing-pin-disc calls for frequent maintenance.

Maintenance free - in case required open top cover. No need to remove valve from pipe line - very low down-time.

For maintenance, valve is required to remove from pipe.
Longer down time.

Same valve can be used for wide range of applications as it can be supplied with ruibber or FRP lining especially for corrosive and errosive applications.

No such possibility. For these applications special metallurgy required to be used which results in paying high cost for the valve.

Vertical or horizontal installation is easily possible

Installation recommended for horizontal position.

Material used is of grade FG 260 having higher tensile strength (26 N/mm2)

Material recommended is FG 200 having lower tensile strength (20 N/mm2)

*For more details contact Normex

 
 
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