Roto-Flate® Inflatable Seal Spherical Valve

What’s New

  • Mechanical interlock of dome rotation and seal inflation, designed to close and inflate in all failure modes, learn more
  • Highly fluorinated elastomer seals for corrosive environments
  • Standard valve fails closed with loss of electricity
  • Optional reserve air tank for loss of pneumatics
  • Inflatable seal lock-in for easy removal and replacement of seal and O-rings
Roto-Flate Industrial Inflatable Seal Valve

Bubble-Tight Against Full Vacuum and Pressure up to 150psig

  • Heavy-duty construction
  • Bidirectional sealing
  • No sliding contact between dome and seal
  • Full-open port
  • Long, low-maintenance service life

 

Roto-Flate® Advantage

Roto-Flate valves feature a bubble-tight sealing system that is ideal for high pressure and vacuum environments. The positive seal prevents leakage of liquids, gasses or dry material into or out of the valve. Bubble-tight sealing means your process runs more efficiently because compressors or vacuum pumps won’t be overloaded.

Pressures & Temperatures:

  • Bubble-tight against full vacuum and pressure up to 150psig
  • Seal pressure 5-15psi greater than system pressure
  • Temperatures up to 475°F, depending on seal material and system pressures. Water cooling available for higher temperatures
  • Hot water & steam heating, jacketing and heat-tracing packages available for thermal regulation of valve body and/or dome

Typical Applications

  • Pneumatic Conveying
  • Tank & Pressure Vessel Discharge
  • Vacuum Dryer Inlet & Discharge
  • Pump-line Shut-off
  • Reactor Inlet & Discharge
  • Gravity Shut-off of Abrasives
  • Lock-hopper Valves

Typical Installation

Lock-Hopper Valves

Two Roto-Flate valves are placed in series and are opened and closed independently so pressure or vacuum is contained above or below the assembly.

industrial lock-hopper valve diagram


Mechanics of Operation

Inflated Seat
Compressed air enters the inflatable seal assembly and inflates the seal against the dome

Deflated Seat
Compressed air is released causing the seal to relax and allowing the dome to rotate.

industrial inflatable seal valve with inflated seat
industrial inflatable seal valve with deflated seat


Materials of Construction

Body, Dome & Retaining Plates: Stainless Steel (316, 304, Duplex), Carbon Steel (4140, WCB, A36), Ductile Iron, Hastelloy, Monel, Other alloys upon request.

Seal Material: Neoprene, Viton®, Viton®-B, Viton®-GF, Viton® Extreme, EPDM, Perflouroelastomer, Buna-N and Heat-Stable Silicon. Some materials available in white.

Coatings & Hardfacings:
Electroless Nickel, Tungsten Carbide, Hard Chrome, Teflon® PFA

Roto-Flate Industrial Inflatable Seal Spherical Valve


Delay Interlock System (DIS)

The Roto-Flate’s Delay Interlock System (DIS) allows the valve to be controlled with just one signal to open and one to close. This unique device, developed exclusively by Roto-Disc, Inc. makes controlling the Roto-Flate as easy as any quarter-turn valve, while still providing the high performance of a two-stage sealing system.

Roto-Flate Industrial Valve Delay Interlock


Roto-Flate Valve with Standard Controls & Flange Arrangement

Roto-Flate Inflatable Industrial Valve Diagram
Roto-Flate Inflatable Industrial Valve Diagram
Roto-Flate Inflatable Industrial Valve Diagram
Valve Size Standard Flange Size Optional Discharge Flange Size A B C D E #Holes x Hole Dia. F G H I J K Weight in S.S. or Carbon Steel w/ Standard Controls LBs. (Kg)
Typical Torque Inch-LB. (nm) **Max. Rec. Torque Inch-LB. (nm)
3 4”
150# ANSI
3”
150# ANSI
3.39
(86)
4.25
(108)
9.00
(229)
7.50
(191)
8 x 0.75
(8 x 19)
5.25
(133)
0.00
(0)
24.03
(610)
0.00
(0)
10.25
(260)
1.48
(37)
60
(27)
1,098
(125)
1,930
(218)
4 6”
150# ANSI
4”
150# ANSI
4.38
(111)
6.12
(156)
11.00
(279)
9.50
(241)
8 x 0.88
(8 x 22)
5.26
(133)
0.00
(0)
26.67
(678)
0.58
(15)
10.55
(268)
2.03
(52)
77
(35)
1,609
(182)
1,930
(218)
6 8”
150# ANSI
6”
150# ANSI
6.50
(165)
8.12
(206)
13.50
(343)
11.75
(298)
8 x 0.88
(8 x 22)
6.84
(173)
0.00
(0)
30.03
(763)
1.08
(27)
11.73
(298)
1.36
(34)
155
(70)
2,442
(276)
4,200
(475)
8 10” 150# ANSI 8” 150# ANSI 8.50
(216)
10.25
(260)
16.00
(406)
14.25
(362)
12 x 1.00
(12 x 25)
7.69
(195)
0.31
(8)
33.20
(843)
2.30
(58)
15.35
(390)
1.78
(45)
250
(113)
4,162
(470)
12,200
(1,378)
10 12”
150# ANSI
10”
150# ANSI
10.50
(267)
12.25
(311)
19.00
(483)
17.00
(432)
12 x 1.00
(12 x 25)
9.57
(243
0.82
(21)
37.19
(944)
2.61
(66)
18.03
(458)
0.10
(24)
313
(142)
6,474
(732)
12,200
(1,378)
12 16”
150# ANSI
12”
150# ANSI
12.50
(316)
15.75
(400)
23.50
(597)
21.25
(540)
16 x 1.12
(16 x 29)
11.44
(291)
0.83
(21)
43.43
(1,103)
2.93
(74)
20.79
(528)
1.33
(34)
555
(252)
10,358
(1,170)
22,700
(2,265)
14 20”
150# ANSI
14”
150# ANSI
14.50
(368)
22.25
(565)
27.50
(699)
25.00
(635)
20 x 1.25
(20 x 32)
13.68
(347)
1.15
(29)
49.43
(1,255)
5.22
(133)
21.25
(540)
1.55
(39)
759
(344)
12,948
(1,463)
36,000
(4,067)
16 20”
150# ANSI
16”
150# ANSI
16.25
(413)
22.00
(559)
27.50
(699)
25.00
(635)
20 x 1.25
(20 x 32)
12.00
(305)
1.92
(49)
51.49
(1,308)
6.28
(160)
24.02
(610)
2.84
(72)
748
(339)
18,727
(2,116)
37,500
(4,237)
18 26”
Series A, CL-150
18”
150# ANSI
18.50
(470)
27.00
(686)
34.25
(870)
31.75
(806)
24 x 1.38
(24 x 35)
16.41
(417)
1.94
(49)
57.57
(1,463)
5.75
(146)
28.42
(722)
1.94
(49)
1,105
(501)
28,466
(3,216)
43,700
(4,937)
20 30”
Series A, CL-150
20”
150# ANSI
20.50
(521)
31.81
(808)
38.75
(984)
36.00
(914)
28 x 1.38
(28 x 35)
18.27
(464)
2.29
(58)
62.57
(1,589)
7.30
(185)
28.42
(722)
1.89
(48)
1,629
(739)
28,466
(3,216)
62,400
(7,050)
24 36”
Series A, CL-150
24”
150# ANSI
24.50
(622)
38.00
(965)
46.00
(11.68)
42.75
(1086)
32 x 1.62
(32 x 41)
22.71
(577)
2.77
(70)
64.62
(1,641)
7.69
(195)
28.83
(732)
0.00
(0)
2,309
(1,047)
34,006
(3,842)
82,000
(9,265)

* Dimensions based on standard flanges and standard control package. Dimensions vary with flange options and other control packages.
** Maximum recommended torque based on standard shaft material and will vary with other materials.