The Original Seat Valve
SRC-LS Sanitary Remote Controlled Long-Stroke Valve
SRC-LS with valve body combination 21

Application

SRC-LS is specially suited for use in sanitary and non-sanitary applications where suspended solids or high viscosity products are processed. This has been achieved by increasing the stroke of the valve plug considerably compared to the standard SRC valve.

Working principle

The valve is operated by means of compressed air and can be supplied with or without spring return. It has few and simple moving parts which results in a very reliable valve.

Standard Design

SRC-LS consists of a long actuator and bonnet, lip seal, a special valve plug and SRC valve body. All parts are assembled by clamp rings and a stem clip-system.
The valve has welding ends as standard.

Actuator function

  • - Pneumatic downward movement, spring return (NO).
  • - Pneumatic upward movement, spring return (NC).
  • - Pneumatic upward and downward movement (AA).

Valve body combinations

 
20 30 21 22 31 32

Materials

Product wetted steel parts: Acid-resistant steel 1.4401 (316L).
Other steel parts: Stainless steel 1.4301(304).
Product wetted seals: EPDM rubber.
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)
Air pressure: 500-600 kPa (5-6 bar).Max. 700 kPa (7 bar).
Max. size Valve size
of solids (mm) 51 mm 63.5 mm 76.1 mm 101.6 mm
Stop valve 35 55 50 50
Change-over valve        
Valve plug up 30 50 50 50
Valve plug down 15 18 24 31

Options

  • - Male parts or clamp liners in accordance with required standard.
  • - ThinkTop®.
  • - Bracket system indication unit.
  • - Stainless steel seal disc replacing standard lip seal.
  • - NOT-element for extra air pressure supply (spring-closed position).
  • - Tangential side port valve.
  • - Product wetted seals of Nitrile (NBR), Fluorinated rubber (FPM) or PTFE.
  • - Service tools for actuator.

Ordering

Please state the following when ordering:

  • - Size.
  • - Actuator function NC, NO or A/A.
  • - Valve body combination.
  • - Options.
  • - Connections if not welding ends.

Pressure drop/capacity diagrams

Stop valve    
 
51 mm / DN50.   63.5 mm / DN65.
 
76 mm / DN80.   101.6 mm / DN100.

Pressure data for SRC-LS

10. Pneumatic downward movement, spring return (NO-lower seat).   30. Pneumatic upward and downward movement (A/A).
20. Pneumatic upward movement, spring return (NC-lower seat).      
Table 1: Stop and change-over valves - Max. static pressure in bar without leakage, valve seat fully closed
Actuator / Valve body Actuator Valve size Air consumption
combination and type/ DN50 DN65 DN80 DN100 (Litres free air/stroke)
direction of pressure function 51 63.5 76.1 101.6 p=air pressure in bar
    mm mm mm mm 51mm 63.5-101.6mm
10 (NO) 3.9 7.8 5.0 3.2 0.32 x p 1.0 x p
  ISO 3.5 7.2 5 3.6    
DIN 3.2   4.0      
10 (NO)         0.32 x p 1.0 x p
ISO 5.6 10.6 7.5 5.3    
  DIN 5.1   6.0      
    5.5 9.2 4.2 3.6    
20 (NC)         0.32 x p 1.0 x p
    7.4 13.0 7.2 5.4    
ISO 2.6 7.0 4.0 3.6    
20 (NC)   7.0   3.6 0.32 x p 1.0 x p
  DIN 2.4   3.2      
    10 10 4.0 3.5    
30 (A/A)         0.64 x p 2.0 x p
    10 10 10 10    
  ISO 9 10 10 8.5    
DIN 8.2   8.0      
30 (A/A)         0.64 x p 2.0 x p
ISO 10 10 10 10    
  DIN 9.1   8.0      
A = Air   SC = Spring closes
AC = Air closes      
Table 2: Stop and change-over valves - Approx. static liquid pressure in bar, against which the valve can open.
Actuator / valve body Actuator Valve size
combination and type/function DN50 DN65 DN80 DN100
direction of     51 63.5 76.1 101.6
pressure     mm mm mm mm
  ISO     8.5  
10 (NO) ISO/DIN 7.2 12.3   5.5
    DIN     7.2  
10 (NO)   7.8 13.3 8.5 6.2
  ISO     9.0  
20 (NC) ISO/DIN 8.4 14.2   6.4
    DIN     7.6  
20 (NC)   6.0 12.3 7.1 5.5
AO = Air opens (6 bar)   SO = Spring Opens

Pressure drop/capacity diagrams

Change-over valve    
 
51 mm / DN50.   63.5 mm / DN65.
 
76.1 mm / DN80.   101.6 mm / DN100.
Dimensions (mm)
Size 51 63.5 76.1 101.6 50 65 80 100
  mm mm mm mm DN DN DN DN
A1 398 571 576 648 397 568 577 647
A2 441 634 641 713 440 631 642 712
A3 487 682 707 800 486 679 708 799
A4 530 742 767 860 529 739 768 859
C 94 113 129 163 94 113 129 160
OD 50.8 63.5 76.1 101.6 53 70 85 104
ID 47.6 60.3 72.1 97.6 50 66 81 100
t 1.6 1.6 2.0 2.0 1.5 2.0 2.0 2.0
E 61.5 82.3 87.3 133.5 61.5 82.3 87.3 133.5
F1 43 63 65 65 43 63 65 65
F2 43 60 60 60 43 60 60 60
H 87 133 133 133 87 133 133 133
M/ISO clamp 21 21 21 21        
M/ISO male 21 21 21 21        
M/DIN male         22 23 25 25
M/SMS male 20 20 24 24        
M/BS male 22 22 22 22        
Weight (kg)                
Stop 7 12 14.5 17.5 7 12 14.5 17.5
Change-over 9 16.5 19 22 9 16.5 19 22
   
a. Stop valve. b. Change-over valve.