VB Series Pressure Steam Vacuum Breaker valve

VB Series Vacuum Breaker

Working principle

Vacuum breakers are used to break the vacuum in steam systems, which can effectively protect the equipment from being in a vacuum state when steam condenses.

Its principle is similar to that of a one-way valve. When the internal pressure of the system is lower than the atmospheric pressure, the vacuum breaker opens. If the internal pressure of the system is high, the vacuum breaker is closed. It is used in: heat exchangers, steam storage tanks, boilers, sandwich pots, sterilization chambers, and steam main lines.

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Product Description

Features	Restrictions		Install
•Simple and strong structure, safe and reliable operation. •No need for operator control, fully automatic operation, using atmospheric pressure as power source, no need for external power source. •Small size, sensitive action. •Easy installation, no need for debugging. •Protect expensive equipment from vacuum damage.	Design pressure (PMA): • VB14 type: 16 bar • VB21 type: 25 bar	Maximum operating pressure (PMO) @ maximum operating temperature (TMO) • VB14 type: 14 bar @ 260 ° C • VB21 type: 21 bar @ 400 ° C	The vacuum breaker must be installed in a vertical position with the system connection port at the bottom of the vacuum breaker. If used in a steam system, the drain valve must be installed at the highest point of the system to prevent the valve from being submerged by condensate.

Technical Parameters

model		VB14	VB21
Connection Type		Thread
Installation		vertical
Maximum steam intake		9000m³/h
Material	Valve bonnet	brass	Stainless steel
	Valve core	Stainless steel	Stainless steel
	Valve Seat	Stainless steel	Stainless steel
	Valve body	brass	Stainless steel
	washer	Stainless steel	Stainless steel

Normal operation: When there is steam in the equipment, the steam pressure acts on the upper part of the valve core, pressing the seal downward. The greater the pressure, the tighter the seal.

When vacuum occurs: When the steam in the equipment condenses, the internal pressure drops until a vacuum appears in the equipment. The valve core opens rapidly due to the air pressure, and air enters the equipment, preventing the vacuum from occurring.

Dimensions/Weight (approximate) mm and Kg

model	VB14	VB21
Nominal diameter	15	15	20
A(mm)	55	52
B(mm)	34	36
C(mm)	34	36
Thread	0.35	0.35

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