Sanitary Safety Relief Valve

• National Board Certified to ASME VIII / XIII   ( UV & NB )
• High cleanability: L/D < 1.5 
• Standard surface finish ASME BPE SF1, 20 Ra μin (0,5 Ra μm) is standard. ASME BPE SF5 and SF4 15 Ra μin (0,4 Ra μm) optional. Electropolished optional 
• FDA and USP Class VI seats, o-rings and bellows seal 
• Bellows seal isolates process from valve internals when valve is open or closed on 83 and 83X Series 
• ASME BPE Tri-Clamp and Tube weld end connections are standard. NPT connections available on SSRV-81 Series
• ASME SA479 316L, AL6XN, Hastelloy C-276 are standard
• Steriflow Premium Cleaning Available – consult factory for details 

SSRV-81 Specifications

Available Connection Size and Type 

• Inlet: – 1/2″ – 1″ MNPT, FNPT – 1/2″ – 1″ ASME BPE Tri-clamp 
• Outlet: – 1/2″ – 1″ FNPT – 1/2″ – 1″ ASME BPE Tri-clamp 

Body and Wetted Trim Materials 

• Standard – ASME SA479 316L (UNS 31603), AL6XN®, Hastelloy®C-22 
• Optional: other materials available ASME BPE Tri-clamp 

Wetted Seat and O-Ring Material 

• FDA and USP Class VI compliant elastomers:
  – EPDM, rated to 300°F
  – Kalrez® FFKM rated to 450°F 
• FDA compliant elastomers:
  – Buna rated to 230°F 

Available Set Point Range SSRV-81V Series 

• 13 – 20 psi* 
• 20 – 26 psi 
• 26 – 45 psi 
• 45 – 64 psi 
• 64 – 102 psi 
• 102 – 145 psi 
• 145 -232 psi 

SSRV-81 Series 

• 232 – 377 psi 
• 377 – 500 psi 

* Valves with set points below 15 psi do not require ASME UV stamp 

Body Pressure/Temperature Rating: 

• 550 psi @ 450°F 

SSRV-83X Specifications

Available Connection Size and Type 

• Inlet: – 1″ ASME BPE Tri-clamp 
• Outlet: – 1 -1/2″ ASME BPE Tri-Clamp 

Body and Wetted Trim Materials 

• Standard – ASME SA479 316L (UNS 31603), AL6XN®, Hastelloy®C-22 
• Wetted O-Ring Material 

Elastomers are all FDA and USP Class VI compliant:
– EPDM, rated to -49°F to 302°F
– Kalrez® FFKM rated to 32°F to 450°F 

Bellows Process Seal Material 

Elastomers are all FDA and USP Class VI complaint
– EPDM rated to -49°F to 302°F 

Body Pressure/Temperature Rating: 

• 255 psi @ 450°F steam/gas/liquid 

Available Set Point Range 

• 12 – 18 psi* 
• 18 – 26 psi 
• 26 – 36 psi 
• 36 – 47 psi 
• 47 – 65 psi 
• 65 – 96 psi 
• 96 – 142 psi 
• 142 – 232 psi
  * Valves with set points below 15 psi do not require ASME UV stamp 

National Board Certified to ASME VIII / XIII   ( UV & NB )
CE/UKCA Certified

81/81V-1TCx1TC
83-1×1.5-BPE
83X-1×1.5-BPE
88-1-1.5×2-BPE
88-2-2×3-BPE
88-3-2×3-BPE

1. What is a sanitary safety relief valve?

   A sanitary safety relief valve (SSRV) is designed to relieve over-pressure conditions in hygienic and aseptic process systems. It automatically opens at a predetermined pressure to protect pressure vessels and equipment from exceeding their design limits, then reseats when pressure returns to normal. Unlike standard relief valves, SSRVs feature sanitary design elements including smooth surfaces, minimal dead space and materials compatible with food and pharmaceutical applications.

2. How does a sanitary safety relief valve differ from a standard relief valve?

Sanitary safety relief valves feature specialized design elements for hygienic applications:
Surface finish: ASME BPE SF1 standard with electropolished surfaces available
Materials: FDA and USP Class VI compliant seats, o-rings, and bellows seals
Connections: ASME BPE Tri-Clamp and tube weld end connections
Bellows seal: Isolates process media from valve internals when valve opens or closes

3. What connection types are available on the sanitary safety relief valves?

Tri-Clamp: ASME BPE standard for easy assembly/disassembly
Tube weld ends: for permanent installations
NPT connections: available on certain series (like the SSRV-81)
Flanged connections: for specific applications

4. Are Sanitary Safety Relief Valves compatible with CIP/SIP systems?

Yes, sanitary safety relief valves are designed to be compatible with Clean-in-Place (CIP) and Steam-in-Place (SIP) processes. The smooth surfaces, minimal crevices, minimal L/D, and appropriate materials allow for effective automated cleaning and sterilization without disassembly.

5. When do safety relief valves begin to open?

SRV’s will open when the pressure pushing against the bottom of the seat exceeds a fixed opposing spring force (set point), and any opposing back pressure force. ASME rules state that Fully Open must occur at pressure < 10% above set point. “Lift Off” for Steriflow SSRV valves occurs at ~ 1% below set point. Our “Fully Open” occurs at ~ 3-5% above set point.

6. After opening, when do safety relief valves close (reseat)?

“Fixed Blowdown” is a term that describes the pressure below the set point when the valve reseats after a release of pressure. That value is not adjustable, it is what it is, for any particular valve. Our Fixed Blowdown pressure is typically 8-9% below set point.

7. Do sanitary safety relief valves provide a means for lifting the plug off the seat for testing purposes?

Yes, all safety relief valves are required by ASME to have a device that can open the valve (without affecting/adjusting the set point) on any steam application, and on any air or water applications if the process temperature (at valve inlet) exceeds 140°F (60°). We can also supply them outside of those applications if requested. Note that customers may also require lifting devices on certain process applications to enable sanitization fluids to pass through the valve.