Hygienic Tank Bottom Zero Dead Leg Diaphragm Valve
- Model:
- DFVM2-2-22
- Place of Origin:
- Wenzhou, China
- Packing:
- Suitable Packing for Sea/Air Transport
- Quantity:
- 1000 Piece/Pieces per Month
- Payment:
- T/T, L/C, Western Union
- Material:
- SS316L
- Connection:
- Clamped-Welded
- Gasket:
- EPDM+PTFE
- Shape:
- U Type
A sanitary diaphragm valve isolates process streams from operating drive mechanisms through an elastomeric barrier compressed against a contoured weir. Smooth unobstructed internal profiles eliminate product entrapment pockets, fulfilling ASME BPE drainability mandates while providing sterile shutoff during Clean-in-Place (CIP) and Steam-in-Place (SIP) thermal routines.
Hydrodynamic Wall Shear Stress and Boundary Layer Flushing
Purging processing lines requires adequate fluid turbulence to scour biological residues from interior metal faces:
| Line Velocity Condition | Reynolds Number Regime | Wall Shear Stress Profile | Residue Clearance Action |
|---|---|---|---|
| 0.8 Meters per Second | Transitional (Re ~ 8,000) | Moderate boundary resistance | Insufficient for particulate films |
| 1.5 Meters per Second | Fully Turbulent (Re ~ 15,000) | High scouring velocity | Rapid polymer film detachment |
| 2.1 Meters per Second | Highly Turbulent (Re ~ 21,000) | Peak hydraulic displacement | Complete boundary layer flushing |
Maintaining fluid velocity past 1.5 meters per second generates sufficient interfacial shear stress to remove sticky fermentation broths. Electropolished contact surfaces with finish levels below 0.38 micrometers Ra minimize cell adhesion, speeding up detergent displacement sequences.
Pneumatic Piston Preload and Water Hammer Suppression
Automated operations subject piping networks to abrupt fluid deceleration when isolation devices shut down rapidly. Incorporating calibrated multi-spring sets within hygienic diaphragm valves counteracts upstream fluid shocks while maintaining controlled closure rates.
Uniform linear spring compression seats the elastomeric membrane without pinching outer perimeter ridges, suppressing cavitation shockwaves and extending cycle life under frequent pneumatic pulsing.
Loop Stagnation Control and Branch Line Elimination
Recirculation headers in purified water loops demand continuous fluid movement across every withdrawal tap. Fabricated directly into processing pipelines, a zero dead leg diaphragm valve mounts the internal weir flush against the pipe diameter.
This continuous geometry prevents static liquid columns from developing room-temperature bacterial growth, ensuring sterile boundary maintenance across intensive manufacturing campaigns.
Complete Vessel Drainage and Outlet Well Alignment
Evacuating fermentation vessels demands unrestricted downward drainage across batch recovery cycles. Welded directly to shallow dish heads, a tank bottom diaphragm valve aligns the intake orifice directly with the lowest container point.
The sweeping internal profile directs concentrated cell slurries outward without pooling around flange welds, ensuring total product clearing ahead of thermal SIP sterilization.
Product Description
| Control mode: | Manual Type & Pneumatic Type |
| Size : | 1/2",3/4",1",1.5",2" |
| Operation : | Normal Open & Normal Close design |
| Connection type: | Clamp or Weld or other |
| Connection: | INCH: 1/2"-2", DIN - ISO: DN10-DN50. other size can be requirement. |
| Working temp: | ASSEMBLING Diaphragm:EPDM(-40 C -150 C0 PTFE/EPDM(-10 C-150 C) |
| Working pressure: | 10 Bar |
| Standard : | OD/ID mirror polished. ID Ra<0.8um. OD- Sand Blasted .or E/P or other ,ID C Ra<0.5um(SF1) or E/P Ra0.3um(SF4) can be requirement. |
