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Vent Tech Model SZG Logo by International Valve » SZG » szg

Vent-Tech Model SZG

The Market Leader in Zero Pressure Flat Float Valve Design

The Vent-Tech Model SZG Sewer Valve is engineered for precise air release and vacuum break functionality in low-pressure and zero-pressure sewer systems. Built to seal reliably at zero hydraulic head, it’s the ideal solution where traditional valves fail—especially in challenging, high-grease environments.

Designed to prevent vacuum-related pipeline collapse and maintain system integrity, the SZG provides unmatched reliability, surge protection, and long-term performance. When pressure conditions fall below 3 psi, this valve becomes the trusted choice for engineers demanding efficiency without compromise.

Key Features
Benefits
  • Optimized air-flow for maximum efficiency
  • Zero psi minimum sealing for low-pressure systems
  • Excellent for high grease applications
  • Low-maintenance stainless steel construction
  • Enhanced wear resistance for extended lifespan
  • Protects pipelines from vacuum-related collapse
  • Maximizes pipeline capacity and reliability
  • Surge and column separation protection
  • Trusted by top civil engineering firms

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Vent-Tech Valve Series Configurations

SZG-C-(SZG 0CS SEC 2)
SZG-C-(SZG 0CS)
SZG-C-(0CA)
SZG-C-(0CF-Y)
SZG-C-(0CF)
SZG-C-(0CM)
SZG-C-(0CR-F)
SZG-C-(0CR)
SZG-C-(0CT)

SERIES-C Combination Air Valves

Shall be four (4) function valves designed to:
  • Exhaust large quantities of air at start-up during the filling of a pipeline system.
  • Prevent the development of hydraulic transients (surge control) during start-up and pressure surges and shall operate automatically.
  • Release accumulated air in a pipeline system while the system is operational and under pressure.
  • Open and admit large quantities of air into the pipeline system during draining or if negative pipeline pressure occurs.
SZG-B-(SZG 0BS SEC 2)
SZG-B-(SZG 0BS)
SZG-B-(0BA)
SZG-B-(0BF-Y)
SZG-B-(0BF)
SZG-B-(0BM)
SZG-B-(0BR-F)
SZG-B-(0BR)
SZG-B-(0BT)

SERIES-B Biased Combination Air Valves

Shall be four (4) function valves designed to:
  • Exhaust controlled quantities of air at start-up during the filling of a pipeline system.
  • Prevent the development of hydraulic transients (surge control) during start-up and pressure surges and shall operate automatically.
  • Release accumulated air in a pipeline system while the system is operational and under pressure.
  • Open and admit large quantities of air into the pipeline system during draining or if negative pipeline pressure occurs.
SZG-V-(SZG 0VS SEC 2)
SZG-V-(SZG 0VS)
SZG-V-(0VF)

SERIES-V Vacuum-Restrictive Air Valves:

Shall be four (4) function valves designed to:
  • Exhaust large quantities of air at start-up during the filling of a pipeline system.
  • Prevent the development of hydraulic transients (surge control) during start-up and pressure surges and shall operate automatically.
  • Release accumulated air in a pipeline system while the system is operational and under pressure.
  • Restrict the admittance of air back into the pipeline.
SZG-N-(SZG 0NS SEC 2)
SZG-N-(SZG 0BS)
SZG-N-(0BA)
SZG-N-(0BF-Y)
SZG-N-(0BF)
SZG-N-(0BM)
SZG-N-(0BR-F)
SZG-N-(0BR)
SZG-N-(0BT)

SERIES-N Vacuum Relief Valves:

Shall be single (1) function valves designed to:
  • Open and admit large quantities of air into the pipeline system during draining or if negative pipeline pressure occurs.
SZG-A-(SZG 0BS SEC 2)
SZG-A-(SZG 0BS)
SZG-A-(0BA)
SZG-A-(0BF-Y)
SZG-A-(0BF)
SZG-A-(0BM)
SZG-A-(0BR-F)
SZG-A-(0BR)
SZG-A-(0BT)

SERIES-A Deep Well Air Valves:

Shall be three (3) function valves designed to:
  • Exhaust controlled quantities of air at start-up during the filling of a pipeline system.
  • Prevent the development of hydraulic transients (surge control) during start-up and pressure surges and shall operate automatically.
  • Open and admit large quantities of air into the pipeline system during draining or if negative pipeline pressure occurs.
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