SD4 Series - Double Seal Valves

Product Type(s) : Double Seal Valves
Description :

SD4 valves are (double seal) safe flow valves designed for safe media separation applications in the food, beverage, dairy, pharmaceutical and chemical industries. It is available as a shut-off, change-over and tank bottom valve. 

WHERE TO BUY

FEATURES

DELTA SD4 valves are (double seal) safe flow valves designed for safe media separation applications in the food, beverage, dairy, pharmaceutical and chemical industries. It is available as a shut-off, change-over and tank bottom valve. Other configurations are available on request. The DELTA SD4 valve is available as a shut-off valve in 4 standard housing configurations. Other configurations are available on request.

Advantages

  • Leakage chamber arranged between the seat seals; the leakage chamber being forcibly closed (open valve) by the two leakage discharge valves (NO) or opened to the atmosphere (closed valve).
  • Excellent hygienic characteristics primarily due to the ball-shaped housing without sump or dome.
  • Profile seat seals providing crevice-free sealing and the compression of the seat seals is controlled by a metallic stop.
  • Leakage discharge valves to drain the neutral area between the seat seals. The leakage discharge valves (activated together with main actuator) are also used as flush - enabling CIP and SIP cleaning of the neutral area.
  • Actuator and control unit are standard parts from the SW4 product line. Additionally, a NOT element is fitted to the control unit as standard enabling to maintain higher line pressures.
Theory of Operation

How does the SD4 Double Seal valve work with leakage chamber ?


 

SD4 valves are used for safe separation of incompatible media. Safe media separation is provided by the two seat seal design.

A ring-shaped leakage chamber is arranged between the two seals. It is forcible closed or opened to the atmosphere by the two leakage discharge valves.

In case seat seal damage, the leakage will be drained through the leakage valves to the atmosphere and indicated.

  1. Control Unit
  2. Pneumatic Actuator
  3. Yoke
  4. Seat seals
  5. Leakage/CIP discharge valve

 

Cleaning of the leakage chamber is undertaken via the leakage valves. The cleaning liquid is supplied via one leakage valve and discharged to the atmosphere via the second one.

The directed flow of the cleaning liquid provides for a perfect cleaning of the whole leakage chamber.

  1. CIP in
  2. CIP out

DIMENSIONS & SPECIFICATIONS

Sizes:  1" - 4" / DN25 - DN100 Product Wetted Parts: AISI 316L / 1.4404 Non-Product Wetted Parts:  AISI 304 / 1.4301 Seal Materials: 

  • Standard EPDM
  • Optional: HNBR, FPM

Min. Control Air Pressure: 87 PSI (6 bar) Max. Control Air Pressure: 116 PSI (8 bar)

OPTIONS & PERFORMANCE

Valve configurations*:

Standard shut-off:  DELTA SD4

Aseptic diaphragm valve:  DELTA SDMS4

Change-over valve:  DELTA SDU4

Tank outlet:  DELTA SDT4

*Combinations of the configurations listed are also available, e.g. aseptic tank outlet version (DELTA SDTMS4) and aseptic change-over valves (DELTA SDMSU4).

Pressure Ratings:

Operating Pressure:  Maximum line pressure: 145 psi (10 bar)

Temperature Ratings:

Operating temperature: Maximum  275ºF (135°C),  Short time 284ºF (140ºC) - no steam

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