Flush Bottom Tank Valve -- Disc Type SS316
Zero Dead Volume Tank Drain Valve for Pharma, Biotech, and Reactor Service
Document No.SV-DS-SPC-006
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers flush bottom tank valves in SS316 with disc flush to vessel bottom for zero dead volume drainage in reactor, CIP/SIP tank, biotech fermentation, and pharmaceutical API recovery applications.
Technical Specifications
| Parameter | Specification |
|---|
| Valve Size Range | DN50 to DN200 (2" to 8") |
| Pressure Rating | PN16 / Class 150 |
| Body Material | CF8M (SS316) with flush bottom profile machined to vessel dish radius |
| Disc Material | SS316 disc with PTFE/EPDM/PFA seal matched to dish radius |
| Seat Material | Integral SS316 lapped seat, Ra 0.8 µm finish |
| Stem Material | SS316 rising stem with ACME threads and thrust bearing |
| Bonnet Material | CF8M (SS316) bolted or clamped bonnet |
| Packing | PTFE/graphite packing with live-loading gland; EPDM for sanitary service |
| Gaskets | Food-grade PTFE or EPDM gaskets for flange joints |
| Temperature Range | -10°C to +180°C (PTFE seal); +250°C with PEEK |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1, tri-clamp, or weld-end to vessel |
| Actuation | Manual handwheel standard; pneumatic cylinder or diaphragm actuator optional |
| Features | Zero dead volume, dip pipe compatible, CIP/SIP, pneumatic option, custom dish radius |
Materials of Construction
| Component | Material |
|---|
| Body | CF8M (SS316) cast stainless steel with flush bottom profile machined to match vessel dish radius within ±1 mm |
| Disc | SS316 disc with PTFE/EPDM/PFA seal profile matched to dish radius for zero-gap seating |
| Seat | Integral SS316 seat, lapped to Ra 0.8 µm finish for bubble-tight shutoff and easy cleaning |
| Stem | SS316 rising stem with precision ACME threads, anti-blow-out collar, and handwheel thrust bearing |
| Bonnet | CF8M (SS316) bolted or clamped bonnet with packing chamber and actuator mounting pad |
| Packing | PTFE/graphite V-ring packing with live-loading; food-grade EPDM for sanitary and CIP/SIP service |
| Gaskets | Food-grade PTFE or EPDM gaskets; tri-clamp ferrule gaskets per DIN 32676 or ISO 2852 |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | API 598 / ISO 5208 / hydrostatic 1.5x PN |
| Certification | CE, PED, ISO 9001, FDA, 3A, EHEDG on request |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | ASME B16.34 / 3A Sanitary Standard / EHEDG |
Notes
- Vessel dish radius must be supplied at order; body is machined to match within ±1 mm for zero dead volume.
- Dip pipe connection size and orientation must be specified at order; standard is 1" NPT or tri-clamp oriented at 45 degrees.
- For CIP/SIP service above 135°C, specify PEEK or platinum-cured silicone seal with high-temperature actuator diaphragm.
- Pneumatic actuation requires 5-6 bar clean dry air; specify double-acting or spring-return (fail-closed) at order.
- Tri-clamp end connections require specified ferrule standard (DIN 32676, SMS, or ISO 2852) at order for gasket compatibility.
