The Original Seat Valve
SRC-RC Remote Controlled Reverse Closing Valve
SRC-RC stop and SRC-RC change-over.

Application

SRC-RC change-over valve is specially suited for sanitary applications in which the possibility to divert flow is required, e.g. for periodical recirculation of product. The SRC-RC change-over valve is used for instance in pasteurising plants to secure recirculation in case an alteration of the product temperature is required. Both SRC-RC stop valve and SRC-RC change-over valve are used in applications where pressure shocks must be avoided.

Working principle

The valves are remote-controlled by means of compressed air. The valve plug closes against the flow to eliminate pressure shocks.
The valves have few and simple moveable parts, which results in a very reliable valve.

Standard Design

SRC-RC consists of actuator, lip seal, plug and valve bodies. All components are assembled by means of clamp rings and a stem clip-system. In the SRC-RC change-over version the stem is not coated with hard chrome as galling is avoided by fitting a plastic guide ring in the bonnet. In the SRC-RC stop valve version the stem is hard chromed and the bonnet is not fitted with a plastic guide.
The valve bodies have welding ends as standard.

Actuator function

  • - Pneumatic downward movement, spring return (NO).
  • - Pneumatic upward movement, spring return (NO).
  • - Pneumatic upward and downward movement (A/A).
  • - Actuator for intermediate position of the valve plug as option (Two-Step or Three-Position).

Valve body combinations

 


 

SRC-RC stop valve


 

SRC-RC Pressure Drop Diagrams

 
 
 
  NOTE! For the diagrams the following applies:
Medium: Water (20°C).
Measurement: In accordance with VDI 2173

Pressure data for SRC-RC

Actuator type / function
10. Pneumatic downward movement, spring return (NC-lower seat)   60. Three-positions (NC-lower seat).
20. Pneumatic upward movement, spring return (NO-lower seat)   70. Three-positions (NO-lower seat).
30. Pneumatic upward and downward movement (A/A).      
Table 1: Max. pressure without leakage at the valve seat
Actuator/valve body combination and direction of pressure Air pressure (bar) Valve sizes
DN40
DN/OD38		 DN50
DN/OD51		 DN65
DN/OD63.5		 DN80
DN/OD76.1		 DN100
DN/OD101.6
Change-over valve Stop valve
  4.5 4 3.8 6 3.5
  5 - 3.5 2.5 5.2 3
  6 - 5.5 4 7.8 4.2
    - 4 2.5 6.2 3.5
5 4.2 4 3.5 4.5 3
6 6.5 6 5.2 8 4.8
5 10 10 10 10**) 9
6 10*) 10*) 10*) 10**) 10
  5 - 10 7.5 10**) 8
  6 - 10*) 9 10**) 10
AC = Air closes   P = Product
SC = Spring closes   *) It is recommended not to exceed 5 bar air pressure.
A = Air   **) It is recommended not to exceed 4 bar air pressure.
Table 2: Max. pressure for opening. The table shows the approx. static pressure (P) in bar against which the valve can open.
Actuator/valve body combination and direction of pressure Air pressure (bar) Valve sizes
DN40
DN/OD38		 DN50
DN/OD51		 DN65
DN/OD63.5		 DN80
DN/OD76.1		 DN100
DN/OD101.6
Change-over valve Stop valve
  6 6.5 5 9.5 5.5
5 6 6 4.4 7.5 5
6 8 8 6 10 7
    - 7.5 5.5 10 6
    - 6.5 4.5 7.5 4.5
    - 9 6.5 10 6.5
  10 10 8 10**) 9.5
  10*) 10*) 10 10**) 10*)
    - 10**) 9 10**) 9
    - 10**) 10 10**) 10
AO = Air opens   P = Product
SO = Spring opens   *) It is recommended not to exceed 5 bar air pressure.
A = Air   **) It is recommended not to exceed 4.5 bar air pressure.
Table 3: Max. pressure without leakage at the valve seat. Stop and change-over valves with extra strong springs.
Actuator/valve body combination and direction of pressure Air pressure (bar) Valve sizes
DN40
DN/OD38		 DN50
DN/OD51		 DN65
DN/OD63.5		 DN80
DN/OD76.1 		DN100
DN/OD101.6
Change-over valve Stop valve
  7 6.5 6 8.5 5.6
5 1.5 1 1.2 0 0
6 3.5 3.5 2.6 3.5 2.5
  - - 6 4.2 9 5
  5 - 0.2 0 1 0.5
  6 - 2.5 1.3 4.5 2.2
AC = Air closes
SC = Spring closes
A = Air
P = Product
Table 4: Max. pressure without leakage at the valve seat. Stop and change-over valves with Specials actuators (dia 133).
Actuator/valve body combination and direction of pressure Air pressure (bar) Valve sizes
DN40
DN/OD38		 DN50
DN/OD51		 DN65
DN/OD63.5
Change-over valve Stop valve
  10 10 10
5 9.5 9.5 9
6 10**) 10**) 10**)
  - - 10 8
  5 - 10 7
  6 - 10**) 10
5 10*) 10*) 10*)
6 10*) 10*) 10*)
  5 - 10*) 10*)
  6 - 10*) 10*)
AC = Air closes
SC = Spring Closes
*) It is recommended not to exceed 3 bar air pressure.
**) It is recommended not to exceed 5.3 bar air pressure.
Dimensions (mm)
  Inch
DN/OD		 DIN
DN
Nominal size 38 51 63.5 76.1 101.6 40 50 65 80 100
A1 387 414.3 450.9 535.8 595.3 386.5 415.5 453.7 541.2 595.5
A2 412 439.3 475.9 567.8 627.3 412 439.5 478.7 573.2 627.5
A3   498.3 554 650.8 742.3   499.5 556.8 661.7 742.5
A4   523.5 579 682.5 774.3   524.5 581.8 693.7 774.5
C 79 94 113 129 163 79 94 113 129 160
C1   84.9 102.1 116 135   84.9 102.1 121.5 138.3
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 2.0 2.0 1.5 1.5 2.0 2.0 2.0
E 49.5 62 82 87 134 49.5 62 82 87 134
E1 20.5 26.8 33.2 39.1 51.8 22 28 36 43.5 53
F1 25 25 25 32 32 25 25 25 32 32
H 89 89 89 133 133 89 89 89 133 133
M/ISO clamp 21 21 21 21 21          
M/DIN clamp         21 21 21 28 28 28
M/ISO male 21 21 21 21 21          
M/DIN male         22 23 25 25 30 46
M/SMS male 20 20 24 24 35          
M/BS male 6 6 6.6 13.5 15.3 6 6 6.6 13.5 15.3
Weight (kg): Stop 6 6 6.6 13.5 15.3 6 6 6.6 13.5 15.3
Change-over:   7.2 8.3 16.3 19.2   7.2 8.3 16.3 19.2
a. Stop valve. b. Change-over valve. Caution, opening/closing time:
Opening/closing time will be effected by the following:
  • - The air supply (air pressure).
  • - The length and dimensions of the air hoses.
  • - Number of valves connected to the same air hose.
  • - Use of single solenoid valve for serial connected air actuator functions.
  • - Product pressure.

Air Connections Compressed air:
R 1/8" (BSP), internal thread.
Fig. 2. Dimensions.

Technical data

Max. product pressure: 1000 kPa (10 bar).
Min. product pressure: Full vacuum.
Temperature range, standard lip seal: -10°C to +140°C (EPDM)
Air pressure: 500 to 700 kPa (5 to 7 bar).
Air consumption (litres free air) for one stroke
Size DN/OD38-63.5 DN/OD76-101.6
  DN 40-65 DN 80-100
Stop /Change-over valve 0.2 x Air pressure (bar) 0.7 x Air pressure (bar)
Actuator function NO and NC NO and NC
Stop/Change-over valve 0.4 x Air pressure (bar) 1.3 x Air pressure (bar)
Actuator function A/A A/A

Materials

 

Product wetted steel parts: Acid-resistant steel 1.4401 (316L).
Finish: Semi bright.
Other steel parts: Stainless steel 1.4301 (304).
Plug stem stop valve: AISI 316L with hard chrome plated stem surface.
Plug stem change-over valve: AISI 316L
Product wetted seals: EPDM rubber.
Other seals: Nitrile (NBR).

Options

  • - Male parts or clamp liners in accordance with required standard.
  • - Control and Indication (see section 3.6 in Product Catalogue).
  • - Actuator with stronger spring.
  • - Larger actuator for valve sizes DN/OD38-63.5/DN 40-65.
  • - Stainless steel seal disc replacing standard lip seal.
  • - Two-step or three-position actuator.
  • - Tangential side port valve.
  • - Surface finish, product wetted parts: Ra ≤0.8 mm.
  • - Product wetted seals of Nitrile (NBR), Fluorinated rubber (FPM) or PTFE.
  • - Service tools for actuator.

Ordering

Please state the following when ordering:

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

Note!

For further details, see instruction IM 70846.