The Original Manual Seat Valve
SMO and SMO-R Sanitary Manual Valves
SMO and SMO-R stop valves.

Application

The sanitary and flexible design of the SMO valve can be used in a wide range of applications , eg. as a stop valve with two or three ports or as a change-over valve with 3-5 ports.
SMO-R is a regulating valve used for manual control of pressure and flow.

Working principle

The valves permit gradual opening and the few and simple moving parts result in very reliable valves easy to dismantle. Operating the SMO-R, the plug can be fixed in the adjusted position with a lock screw.

Standard Design

SMO and SMO-R are manually operated versions of the pneumatic remote-controlled SRC valve.
The SMO can easily be converted to a SRC valve by replacing the crank mechanism with an SRC actuator. The other parts are identical.
As an optional extra (except for 25mm/DN25) the valves can be fitted with the same diaphragm stem seal as the ARC-valve thus forming an aseptic manually-operated valve, type AMO/AMO-R.

Valve body combinations


 

Other valves in the same basic design:
- Sanitary Remote-Controlled valve, type SRC.

Control function - SMO-R

The Kv factor states the flow in m3/h at a pressure drop of 1 bar over a completely open valve.
The plugs have linear characteristics. This means that a certain amount of throttling, by reducing the stroke, results in a proportional reduction of the flow if the pressure drop remains unchanged.

Example:

51 mm valve, Kv 72.
The flow through the valve is 72 m3/h if the pressure before the valve is 1 bar and the outlet after the valve is free, or for example, 3 bar before the valve and 2 bar after.
When the valve is throttled to half open (50% of the full stroke) the flow will be reduced by 50% to 36 m3/h provided the pressure drop is 1 bar.

Materials

Product wetted steel parts: 1.4401 (316L)
Other steel parts: 1.4301 (304)
Plug stem: 1.4401 (316L) with chromium plated surface
Product wetted seals: EPDM.
Other Seals: : NBR and FPM.
Finish Semi bright

Technical data

Max product pressure: 1000 kPa (10 bar).
Min. product pressure: Full vacuum.
Temperature range: -10°C to +140°C (EPDM).

Pressure drop/capacity diagram for SMO-R:


Fig. 2. The flow in % of the total flow at a pressure drop of 1 bar.

Options

  • - Male parts or clamp ends in accordance with required standard.
  • - Stainless steel disc replacing standard lip seal.
  • - Product wetted seals and lip seal of Nitrile (NBR), Fluorinated rubber (FPM) or PTFE.

Ordering

Please state the following when ordering:

  • - Connections if not welding ends.
  • - Size.
  • - Valve body combination.
  • - Options.

Pressure drop/capacity diagrams for SMO:

The same as SRC or ARC valves.

Kv-Factors

Valve size Kv
38mm/DN40 17*/43
51mm/DN50 72
63.5mm/DN65 114
76.1mm/DN80 155
101.6mm/DN100 160
* Kv 17 is optional

For other pressure drops than 1 bar the flow can be calculated with the following formula:

Q = Kv x √Δp

Where
Q = Flow in m3/h.
Kv = See above.
Δ p = Pressure drop in bar over the valve.

Example:

Plug Kv 72

 
Q to be calculated: Q = 72 x √2 = 100 m3/h
Δp = 2 bar or at 50% stroke:Q = 0.5 x 72 x √2 = 50 m3/h
 

Conversion factors:

Kv = m3/h at a pressure drop of 1 bar.
Cv = US gall/min at 1 psi pressure drop.
Kv = Cv x 0.85.
Cv = Kv x 1.18.

Dimensions (mm) - SMO-R
Size 38 51 63.5 76.1 101.6 40 50 65 80 100
  mm mm mm mm mm DN DN DN DN DN
A1 170 182 217 232 304 168 181 214 233 303
A2 202 214 249 264 336 200 213 246 265 335
OD 38.1 50.8 63.5 76.1 101.6 41 53 70 85 104
ID 34.9 47.6 60.3 72.1 97.6 38 50 66 81 100
t 1.6 1.6 1.6 2 2 1.6 1.6 2 2 2
E 49.5 61.5 82.3 87.3 133.5 49.5 61.5 82.3 87.3 133.5
F 32 32 32 32 32 32 32 32 32 32
H 80 80 80 80 80 80 80 80 80 80
M/ISO clamp 21 21 21 21 21          
M/ISO male 21 21 21 21 21          
M/DIN male           22 23 25 25 30
M/SMS male 20 20 24 24 35          
M/BS male 22 22 22 22 27          
Weight (kg) 2.5 3.0 3.5 7.5 9.5 2.5 3.0 3.5 7.5 9.5


Fig. 2. Dimensions

Dimensions (mm) - SMO
Size 25 38 51 63.5 76.1 101.6 25 40 50 65 80 100
  mm mm mm mm mm mm mm mm mm mm mm mm
A1 226.8 268 278 312 329 401 226.4 266 277 309 330 400
A2 195.8 237 247 281 298 370 195.4 235 246 278 299 369
A3 289.3 347 372 425 458 564 288.9 345 371 422 459 566
A4 258.3 316 341 394 427 533 257.9 314 340 391 428 535
C 55.6 79 94 113 129 163 55.6 79 94 113 129 160
OD 25.2 38.1 50.8 63.5 76.1 101.6 29 41 53 70 85 104
ID 22.2 34.9 47.6 60.3 72.1 97.6 26 38 50 66 81 100
t 1.5 1.6 1.6 1.6 2 2 1.5 1.5 1.5 2 2 2
E 57 50 62 82 87 134 57 50 62 82 87 134
F 22.5 31 31 31 31 31 22.5 31 31 31 31 31
H 105 105 105 105 105 105 105 105 105 105 105 105
M/ISO clamp 21 21 21 21 21 21            
M/ISO male 21 21 21 21 21 21            
M/DIN male             22 22 23 25 25 30
M/SMS male 20 20 20 24 24 35            
M/BS male 22 22 22 22 22 27            
Net weight
Stop valve (kg)		                        
SMO 2.6 2.5 3.0 3.5 7.5 9.5 2.6 2.5 3.0 3.5 7.5 9.5
AMO - 3.6 4.5 5.1 8.6 11.0 - 3.6 4.5 5.1 8.6 11.0
Net weight
Change-over valve (kg)		                        
SMO 3.4 3.5 4.1 4.9 9.7 12.4 3.4 3.5 4.1 4.9 9.7 12.4
AMO - 4.1 5.0 5.6 12.1 14.0 - 4.1 5.0 5.6 12.1 14.0
a. Stop valve. b. Change-over valve.
Fig. 3. Dimensions.