DEMBLA VALVES LTD.

Dembla

FLOATING BALL VALVE

SERIES - 8100
First issue Aug -2014 : Rev-1 Aug-2021

Aiming at perfection
More Info - www.dembla.com
 BALL VALVES

Product Range
Rating SIZES
End
Construction Connection Port INCH ½” 3/4” 1” 1 ½” 2” 2 ½” 3” 4” 6” 8”

Class MM 15 20 25 40 50 65 80 100 150 200

Single Piece Flanged Reduced 150

Two Piece Flanged Full / Reduced 150/300/

600
3 -Way T Port Flanged Full 150/300
3 -Way L Port Flanged Full 150/300

Features
Live Loaded Gland Packing
Graphite Packing are provided as standard taking care of Fire Safe Design Condition. Belleville Springs
Washers are used to achieve live loading which protects Gland loosening under vibrations & shock
conditions.
Antistatic Device
To ensure Electrical Continuity between the Stem and Ball and Body all Valves are provided with
Antistatic device as an integral part of Floating Ball Valves.
Blow Out Proof Stem
Stem is Designed to include a collar to provide protection against Blow Outs.
Double ‘D’ Stem to Lever Connection
Stems are Designed to have Double ‘D’ Connection at the top for Lever Fixing. This feature eliminates
possibility of Lever Assembly in the wrong direction as the Lever indicates the Valve Position once installed
on the line.
Equalized Cavity Pressure
The Pressure equalization hole at the top of the Ball combined with Seat Design are Engineered to
maintain the Pressure balance in the line & in the Body Cavity irrespective of Valve Position
Locking Device
Locking devices are provided on all Valves with both Lever Operator ad Gear Operator.
Integral Actuator Mounting Pad

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 BALL VALVES

Design Features
Stem Seal Fire Safe

GROOVE FOR RELIEF

CAVITY PRESSURE
Primary Soft Seat

We provide multiple stem sealing for high Fire safe design as per API 607, API 6FA
degree of sealing.

Body Sealing ISO Pad

ISO PAD AS PER ISO 5211
O rings
Gasket

We provide O ring & Gasket between body We provide mounting pad for actuator/gear
and side connection for effective sealing. operated mounting as per ISO 5211

Cavity Pressure Relief :-

Some line fluid is usually left trapped inside the ball-body cavity. This fluid can expand under the influence
of high ambient and line temperature. An abnormal increase of such cavity pressure may sometimes damage
the valve seats or balls, unless the valve has an adequate cavity pressure relief provision. General solution for
floating ball valve is to provide hole in the ball-stem slot to equalize the pressure behind the valve cavity.

Seats with pressure-relieving seats :-

In floating ball valves the line pressure forces the ball to the downstream seat, the seat flexes and creates
the seal. The upstream seat is forced forward, allowing the pressure to penetrate from behind through the
grooves and into the body cavity, which relieving the load and prevent the seat damage.

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 BALL VALVES

Design Features
Lipseal Design (Optional)

Lipseal is the spring-energized seal including Elgiloy or Inconel spring and

PTFE jacket. It’s effective in a wide range of application, such as high
resistance to corrosive chemical media, high sour gas, low temperature or
cryogenic service.

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 BALL VALVES

Design & Testing Standards

Design Standard:. End Connection Standards:.
q ASME B16.34 q Face to Face : ASME B16.10 / API 6D
q API 6D q Flange Dimensions : ASME B16.5, EN 1092 ,
q BS -5351 JIS B 2220 ,
q ISO 17292 q Butt weld End Dimensions : ASME B16.25,
q ISO 5211 (Mounting Pad) q Socketweld End Dimensions: ASME B16.11
q Screwed End Dimensions : ASME B 16.11
Testing Standards
q Pressure Testing : API 598, API 6D, ASME/FCI 70.2, EN 12266-1, ISO 5208
q Fire Testing : API 607 / API 6FA
q Nace Requirements : MR 01-75
q Fuggitive Emission Testing : ISO 15848-2

Valve Construction

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 BALL VALVES

Material Options

Part Name Casting Forgings

VALVE BODY A 216 WCB, A 351 CF8 A 105, A 350 LF2 , A 350 LF3, A 182 F6a
SIDE CONNECTION A 351 CF8M, A 351 CF3 A 182 F 304, A 182 F 316, A 182 F 316LN
BALL A 351 CF3M, A 352 LCB A 182 F 321, A 182 F 44(6% MO)
A 217 CA 15, A 148 C95000 A 150 C 63000 (Al. Bronze),
(AL. BRONZE) A 182 F 51 (Duplex S.S.)
(DUPLEX) INCONEL 625 (UNS N 06625)
SUPER DUPLEX INCONEL 825 (UNS N 8825)
ALLOY 20 MONEL K 400 (UNS N 04400)
HAST C 276 MONEL K 500 (UNS N 05500)

STEM A 105, A 350 LF2 , A 350 LF3, A 182 F6a

A 182 F 304, A 182 F 316, A 182 F 316LN
A 182 F 321, A 182 F 44(6% MO)
A 150 C 63000 (Al. Bronze),
A 182 F 51 (Duplex S.S.)
INCONEL 625 (UNS N 06625)
INCONEL 825 (UNS N 8825)
MONEL K 400 (UNS N 04400)
MONEL K 500 (UNS N 05500)

SOFT SEAT PTFE , RPTFE, NYLON 12-G, DEVLON , PEEK

SEALS NITRIL, EPDM, VITON B, VITON GLT

GASKET PTFE, RPTFE, GRAPHITE

STUDS/BOLTS A 193 GR. B7 A 194 GR. 2H

& NUTS A 193 GR. B7M A 194 GR. 2HM
A 320 L7 A 194 GR. 7 or GR.4
A 320 L7M A 194 GR 7M
A 320 L43 A 194 GR. 7M
A 193 GR. B8 A 194 GR. 8
A 193 GR. B8M A 194 GR. 8M

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 BALL VALVES

Parts Illustrated

ITEM PART NAME

1 BODY
2 SIDE CONNECTION
3 BALL
4 STEM
5 SEAT
6 ‘O’ RING (STEM TO BODY)
7 GASKET
8 SPACER
9 CUP SPRING
10 STEM NUT
11 LEVER
12 STOP PIN
‘O’ SEAL RING BODY TO
13
SIDE CONNNECTION
14 STUD
15 NUT
16 HANDLE

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 BALL VALVES

Two Piece Ball Valve

ASME 150 Full Bore

Size DN ASME 150 Full Bore (SP)/(LP) (SP*)/(LP)
Class 15 20 25 40 50 65 80 100 150 200
B 14 19 25 38 50 62 76 102 152 198/203
F/F 108.0 117.0 127.0 165.0 178 190.0 203 229 267/394 292/457
H 94 100 128 146 176 188 218 243 270 -
L 180 180 210 210 290 290 400 450 990 -
ISO 5211 MTG F05 F05 F05 F05 F07 F07 F10 F10 F12 F14
WT (Kg) 2.0 2.6 3.6 6.0 10 16 20 38 70/92 140/150

ASME 150 Reduced Bore

Size DN ASME 150 Reduced Bore (SP) (SP)
Class 15 20 25 40 50 65 80 100 150 200
B1 9 14 19 32 38 50 62 76 102 152
B 14 19 25 38 50 62 76 102 152 203
F/F 108.0 117.0 127.0 165.0 178.0 190.0 203.0 229 267 292
H 62 94 102 128 148 176 189 218 246 276
L 104 180 180 210 210 290 290 450 450 990
ISO 5211 MTG F03 F05 F05 F05 F05 F07 F10 F10 F10 F12
WT (Kg) 1.3 2.3 2.8 4.0 8.1 13.5 17.4 28.1 44.2 79

ASME 300 Full Bore

Size DN ASME 300 Full Bore (SP/LP)
Class 15 20 25 40 50 65 80 100 150 200
B 14 19 25 38 50 62 76 102 152 203
F/F 140.5 152.0 165.0 190.0 216 241.0 283 305 403.4 419.0/502
H 92 100 126 149 180 189 222 246 - -
L 180 180 210 210 290 290 450 450 - -
ISO 5211 MTG F05 F05 F05 F05 F07 F07 F10 F10 F14 F14
WT (Kg) 2.7 3.6 5 9.5 15 25 32 52 115 185/195

ASME 300 Reduced Bore

Size DN ASME 300 Reduced Bore (SP)

Class 15 20 25 40 50 65 80 100 150 200
B1 9 14 19 32 38 50 62 76 102 152
B 14 19 25 38 50 62 76 102 152 203
F/F 140.5 152.0 165.0 190.0 216 241.0 283 305 403.4 419.0
H 62 92 102 128 149 180 189 222 248 -
L 104 180 180 210 210 290 290 450 450 -
ISO 5211 MTG F03 F05 F05 F05 F05 F07 F07 F10 F10 F14
WT (KG) 1.8 3.3 4.2 8.4 11.6 20.0 22 38 87 142.5

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 BALL VALVES

Two Piece Ball Valve

ASME 600 FULL BORE / REDUCED BORE

CLASS ASME 600 FULL BORE / REDUCED BORE
SIZE DN 15 DN 20 DN 25 DN 40 DN 50 DN 80 DN 100 DN 150
FB FB RB FB RB FB RB FB RB FB RB FB RB RB
B x B1 14 19 14 25 19 38 25 50 38 76 50 102 76 152 x 102
F/F 165.0 190.5 190.5 216.0 216.0 241.3 241.3 292.0 292.0 355.6 355.6 432.0 432.0 559
H 69.0 69.0 69.0 65.0 68.0 90.0 68.0 108.0 93.0 148.0 108.0 186.0 148.0 186
L 212.0 212.0 212.0 205.0 212.0 275.0 205.0 455.0 275.0 692.0 455.0 990.0 692.0 990
ISO 5211 MTG F05 F05 F05 F05 F05 F05 F05 F07 F05 F10 F07 F14 F10 F14
WT (Kg) 4.2 4.5 - 6.8 - 12.7 - 17.0 16.0 39.0 - 80.0 60.0 -

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 BALL VALVES

Flow Path Diagram for Multiport Valves

Automation
Pneumatic Actuators (Double acting or single acting) along
with variety of accessories are provided for on-off or control
duty applications. The valve Units are supplied duly mounted,
Hooked & Calibrated with pneumatic actuators & accessories.

For automated valves flail close / open / stay put conditions are
achieved using various accessories.

With Double acting actuators for fail / open / close

requirements, volume tanks arrangements is supplied along
with actuators.

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 Engineering Data BALL VALVES

Torque Values (Nm)

Torque Chart for Floating Ball Valves

900 1500
Size (mm) 150 Class 300 Class 600 Class
Class Class
DP (Bar)
10 20 20 40 55 60 100 150 250
FB RB

15 20 4 5 5 7 9 15 20 25 35

20 25 6 8 8 9 12 20 30 35 45

25 32 10 12 15 18 20 30 45 70 115

32 40 15 19 19 22 25 45 70 100 160

40 50 20 25 25 28 30 75 90 140 180

50 65 30 40 40 45 50 95 130 200 300

65 80 35 45 55 65 70 110 150 320 450

80 100 55 70 75 100 110 130 200 435 600

100 150 110 130 165 175 180 280 370

150 200 280 350 400 430 550 800 1000

200 250 690 800 850 900 1000

Notes:
1.0 These Torque values indicate Break Open Torque.
2.0 For Closing Torque values Multiply by 0.8.
3.0 For Run Torque Values Multiply by 0.45.
4.0 These Torque Values are based on clean Fluid.
5.0 For Dry Gas / Uncleaned luid / Slurries applications Multiply by 1.2
6.0 For cryogenic application multiply by 2.5.
7.0 Above values are suitable for seat materials PTFE / RPTE/DEVELON/ NYLON. For seat
material PEEK multiply by 2.0 for metal seat multiply by 4.0

ACTUATOR SIZING
Frist consider factor of safety for luid conditions and seat MOC then,
A. For selecting Gear Operator multiply by 1.5.
B. For Selecting pneumatic or electric Actuator multiplay by 1.3.

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Sales Office: Dembla Works:
M/S. Dembla Valves Ltd. M/S. Dembla Valves Ltd.
C-30, Jai Matadi Compound, Kalher A/8, Arahm Logic Parc, Valshind Village,
Village,Thane-Bhiwandi-Agra Raod - Mumbai -Nashik Highway
421302, (NH3),Bhiwandi
Maharashtra,India. Thane - 421302. Maharashtra (India)
Tel - +91-9292234790 - 97
E-mail - expo@dembla.com
More info - www.dembla.com
Dembla Valves |8100