D4 / DA4 Series - Double Seat Mix Proof Valves

Benefits

Maintenance and operation savings

• Reduced inventory costs with same seal kit used on multiple size ranges: DN40-DN65 (1.5-3.0) and DN80-DN100 (4.0) 
• Reduced CIP losses improve cost savings
• Low air consumption and air supply requirements
• Long housing ports ease manifold building 
• Integrated shaft seal flush reduces need for external piping
• Standard cavity spray cleaning. Extensive cleaning of product contact seals

Reliable Performance

• Fully balanced design helps to prevent hydraulic blocking, withstand pressure spikes, and enables flexible flow direction without slamming
• Slim stainless actuator is fully enclosed to prevent fluid ingress
• Light overall weight helps support handling without lifting tools. No compressed air needed for removal and servicing
• Range of control units and bus communication for automated operation

Valve structure

1. Radial seal design for reduced losses of product fluids during switching.
   Benefits: Product cost savings; cleaner operating environment.
2. Integrated upper and lower shaft seal and balancer flushing.
   Benefits: Extensive cleaning of product contact surfaces.
3. Metal orficies control CIP flow during seat lift.
   Benefits: Reduces chemical and water loss consumption.
4. Open yoke design (the element connecting the pneumatic actuator and the valve body).
   Benefits: Reduces heat transfer from product zone into actuator; provides visual leak detection of damaged shaft seals; safety guard provided to reduce pinch points.
5. Bolted flange connection for housing insert (consists of yoke, pneumatic actuator, seats and shafts).
   Benefits: Heavy-duty, secure connection; reliable and controlled assembly and disassembly of valve insert.
6. Long ports to ease manifold building.
   Benefits: Helps to reduce spool pieces and welds to ease manifold building.
7. Balanced upper and lower shafts.
   Benefits: No hydraulic blocking; resistant against pressure spikes; flexibility in either flow direction through the valve (top-to-bottom or bottom-to-top) without water hammering.
8. Large separation cavity drain port.
   Benefits: Less product risk and prevention of pressure build-up that could cause cross-contamination.
9. Flush cavity spray fixed connection.
   Benefits:  Enhanced cleaning; removal of residual media in separation cavity when full CIP is not readily available; hard-piped flush can be used without need to be removed during valve maintenance.