Roto-Disc®II Lighter-Weight Spherical Valve

In A Flash

  • Same essential features as the original Roto-Disc® spherical valve
  • Lighter weight body design
  • Outlet opening and flange match valve size
Roto-Disc II industrial spherical valve


Materials of Construction

Body & Dome: Stainless Steel (316, 304, Duplex), Carbon Steel (4140, WCB), Hastelloy, Monel, Other alloys upon request

Soft Seats: Stainless Steel Reinforced PTFE, Glass Reinforced PTFE, PEEK, Nylon, Modified TFM, PFA, UHMW

Metal Seats: Stainless Steel (316, 304), Abrasion Resistant Steel (AR400), Bronze, Other alloys

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

Typical Applications

  • Hopper Discharge
  • Blender Discharge
  • Loss-in-weight Feeders Refill
  • Bulk-bag Unloading
  • Other Gravity-flow / Low Pressure Applications

Pressures Range‡: Full vacuum to 50psig below valve. Full vacuum to 10psig above valve.

Temperature Range‡:
-40°F – 1200°F (-40°C – 650°C).

‡ Pressure and temperature limits of an individual valve depend on a variety of application conditions and materials of construction of the valve.


Roto-Disc Valve with Standard Controls & Standard Flange Arrangement

Diagram of rotodisc - the original spherical valve
Diagram of rotodisc - the original spherical valve
Diagram of rotodisc - the original spherical valve
Valve Size Standard Inlet Flange Size Optional Inlet Flange Size Outlet Flange Size A B C D E #Holes x Hole Dia. F G H J K L M 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”
150# ANSI
3.38
(86)
3.26
(83)
9.00
(229)
7.50
(191)
8 x 0.75
(8 x 19)
5.50
(140)
0.44
(11)
22.81
(579)
10.25
(260)
4 X 0.75
(4 X 19)
6.00
(152)
7.50
(191)
50
(23)
1,098
(125)
1,930
(218)
4 6”
150# ANSI
4”
150# ANSI
4”
150# ANSI
4.38
(111)
4.26
(108)
11.00
(279)…..
9.50
(241)
8 x 0.88
(8 x 22)
5.88
(149)
0.72
(18)
25.44
(646)
10.55
(268)
8 x 0.75
(8 X 19)
7.50
(190)
9.00
(229)
66
(30)
1,609
(182)
1,930
(218)
6 8”
150# ANSI
6”
150# ANSI
6”
150# ANSI
6.5
(165)
6.36
(161)
13.50
(343)
11.75
(298)
8 x 0.88
(8 x 22)
7.00
(178)
1.44
(37)
29.13
(740)
11.73
(298)
8 X 0.88
(8 X 22)
9.50
(241)
11.00
(279)
96
(43)
2,442
(276)
4,200
(475)
8 10” 150# ANSI 8” 150# ANSI 8” 150# ANSI 8.50
(216)
8.33
(212)
16.00
(406)
14.25
(362)
12 x 1.00
(12 x 25)
9.00
(229)
1.75
(44)
32.34
(822)
15.35
(390)
8 X 0.88
(8 X 22)
11.75
(298)
13.50
(343)
138
(63)
4,162
(470)
12,200
(1,378)
10 12”
150# ANSI
10”
150# ANSI
10”
150# ANSI
10.50
(267)
10.42
(265)
19.00
(483)
17.00
(432)
12 x 1.00
(12 x 25)
10.88
(276)
2.39
(61)
35.95
(913)
18.03
(458)
12 X 1.00
(12 X 25)
14.25
(362)
16.00
(406)
209
(95)
6,474
(732)
12,200
(1,378)
12 16”
150# ANSI
12”
150# ANSI
12”
150# ANSI
12.50
(318)
12.39
(315)
23.50
(597)
21.25
(540)
16 x 1.12
(16 x 29)
13.75
(349)
2.52
(64)
42.44
(1,078)
20.79
(528)
12 x 1.00
(12 x 25)
17.00
(432)
19.00
(483)
398
(181)
10,358
(1,170)
22,700
(2,265)

 

* 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.


Roto-Disc valve fully open

Roto-Disc totally open:

Material falls unobstructed through the inlet opening. Nothing is in the flow stream to cause product bridging, so you get the full flow capacity of the valve. Notice that the sealing surfaces are protected from direct contact with material.

Roto-Disc valve closing

Roto-Disc closing:

As the valve begins to rotate closed, the dome wipes against the seat, cutting off the flow of product and pushing material above or below the valve instead of wedging it between the dome and seat. The design naturally resists abrasive wear and there are no pinch points or places for material to hang-up.

Roto-Disc valve fully closed

Roto-Disc fully closed:

Closure is clean and the valve is fully seated. The dome and seat form a positive seal that eliminates leakage across the seat. Double O-rings prevent leakage through the stems.