Pentair Südmo Double Seat Valve DSV Complete

Based on its many years of experience in valve construction, Südmo offers a comprehensive, refined double-seat valve for implementation and automation of widely varying production processes in the food and beverage  industry. Why use Südmo double seat valves? As well as a wide range, the series is characterized by ease of handling and maintenance, and is therefore the ideal component for operating your processes with maximum efficiency and safety.

General Requirements For Hygienic Double Seat Valves

• Reliable separation of two media (e.g. product and cleaning liquid)
  > Two sealing elements work separately
  > Leakage chamber open to atmosphere
  - Avoids pressure build-up
  - Visual leak detection
• All surfaces in contact with product can be cleaned

Function

The function of the double-seat valve is shown in the below tank farm application example. Simultaneous, programmed filling, emptying and cleaning of four production lines without risk of mixing. Reliable separation of upper and lower valve housing allows one or more lines or tanks (purple and red lines) to be cleaned during production (yellow and green lines).

Innovative Sealing Concept

In seat area

• Step seat with conical seal o-ring
• Radial seat with RSC seal (Radial Seal Complete)

In shaft area

• Sealing by form-fit profile seal

 High Operating Pressures

• Open, close and seal up to 10 bar*
• High pressure pulse resistance

* Depending on type and nominal width

Safe Cleaning

• Cycle stroke with defined ring gap
• Leakage chamber flushing via external connection
• Sterile chamber for shaft flushing / sterilization
• Shaft flushing of lower valve disc

Optimized Drive & Control Concept

• Durable pneumatic seals
• Main spring chambered
• All valve positions can be monitored IntelliTop 2.0 control unit

Top Quality

•  Body machined from solid bar stock
• High surface quality
• Reduced-friction surfaces on moving parts
• Design optimized for cleaning

Service

• Simple, rapid maintenance
• No special tools needed
• Easy handling thanks to compact construction
• Low maintenance costs (Opex)

 

 

Seat Area (On Type D 620)

Double O-ring seal
In the upper valve disc, the upper O-ring ensures a product seal in closed valve position, and lower O-ring ensures a leakage chamber seal in open valve position

RSC radial seal
Special shape ensures improved performance and doubling of swell compensation compared with conventional radial O-ring seals. Smaller contact area ensures longer life

 

 

 

 

Lower Shaft Passage

Profile seal
Minimised contact areas to ensure long life and improved wear and friction behaviour; special design prevents press-out (pressure pulses) or pull-out (sticky media).

Support ring
Ensures improved guidance and optimum friction behaviour

O-ring
Seal between valve housing and housing cover

 

 

Basic Valve Functions

Basic Valve Positions

Valve closed

• Media are separated, secure against mixing
• Any leaks escape to the environment without pressure

Valve open

• Lower valve disc lifts and closes the leakage chamber
• Product in the leakage chamber is discharged to the outside

Valve Cleaning - Cyclic Functions

Cleaning via lower valve seat

• Lower valve disc is raised while cleaning the lower line (cyclic lift via predefined ring gap)
• Lower valve seat, disc seal, leakage chamber and leakage drain are cleaned

Cleaning via upper valve seat

• Upper valve disc is raised while cleaning the upper line (cyclic lift via predefined ring gap)
• Upper valve seat, disc seal, leakage chamber and leakage drain are cleaned

Extended Valve Functions

Leakage Cleaning via External Flushing Connection

Cleaning of leakage chamber via external flushing connection

• Leakage chamber and leakage drain are cleaned via an external connection

Sterilisation / Flushing Upper and Lower Shaft Area

Sterilisation or flushing via external connections

• Sterilisation or flushing of lower and upper shaft area

Shaft Flushing of Lower Valve Disc 

Flushing of lower shaft area (Scallop design)

• Flushing of shaft area during activation of cyclic lift of lower valve plate

DSV Complete Options

Low Leakage

Closed
Lower valve disc with conical seal

Movement of lower disc
Lower line OPEN
Leakage chamber open
->Flushing effect / Product loss

Movement of lower plate
Lower line open
Leakage chamber closed

Open
Valve open
Leakage chamber closed

Leakage-free

Closed
Lower valve disc radial seal (RSC seal)

Movement of lower disc
Lower line CLOSED Leakage chamber open
-> No product loss

Open
Valve open
Leakage chamber closed