Spirax-Sarco 0190192 Vacuum Breaker

For steam and liquid system protection, the Spirax-Sarco 0190192 (Model VB21) is the industry standard for preventing vacuum formation in heat exchangers, jacketed kettles, and steam coils. As a veteran technician knows, a vacuum in these systems can lead to catastrophic coil collapse, water hammer, or stalled condensate drainage. This 1/2" NPT vacuum breaker is engineered with a high-grade 303 stainless steel body and a precision-ground stainless steel check ball, ensuring a positive seal under pressure and rapid opening at just 2" H2O (0.15" Hg) vacuum. Rated for a maximum operating pressure (PMO) of 304 psig and temperatures up to 752°F, the VB21 stainless steel vacuum breaker provides reliable condensate drainage protection in even the most demanding process environments. Its compact, non-maintainable design ensures a leak-free steam system vacuum relief solution, making it an essential component for modulating heat exchangers and boiler feed tanks.

• Stainless Steel Construction: High-grade 303 SS body and 440C stainless valve ball provide maximum corrosion resistance and durability in high-pressure steam.
• Rapid Vacuum Response: Actuates at a differential pressure of 4.6 mm Hg (approx. 2" H2O) to instantly prevent negative pressure issues.
• High Thermal Limits: Capable of handling extreme system temperatures up to 752°F (400°C) without seal degradation.
• Tight Shut-off: Precision ball check design ensures zero leakage during normal pressurized operation up to 304 psig.
• Simplified Installation: 1/2" NPT system connection allows for easy vertical mounting at the highest point of the steam circuit.

Where should the VB21 be installed for maximum effectiveness?
It must be installed in a vertical position with the system connection at the bottom. For steam applications, place it at the highest point in the circuit, typically between the control valve and the equipment, to ensure it doesn't get flooded with condensate.

Can the internal components of the Spirax-Sarco 0190192 be repaired?
The VB21 is a purpose-designed, non-maintainable unit. If the seat is damaged by debris or fails to seal, the entire unit must be replaced to ensure system integrity.

What is the difference between the VB21 and the VB14?
The VB21 features a full stainless steel body and components, making it suitable for higher pressures (304 psig) and temperatures compared to the brass-bodied VB14 (210 psig).

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.