Miyawaki CVU15 Vacuum Breakers

Manufacture: MIYAWAKI Inc.
Model: CVU15

Features

Superb durability
The body of the product is made from stainless steel, making it durable and corrosion-resistant.

Compact and cost effective design
It has a space saving, simple mechanism with very few moving components.
It is only vertical installation.

Wide range of use pressure and temperature
Max. operating pressure is 2,1MPa (305psig) and max. operating temperature is 450℃ (842°F).
The CVU15 vacuum breaker is an automatic valve that takes in air from outside into a steam system and breaks occurred vacuums.

Typical applications

Suitable for steam devices, steam lines, and liquid devices such as boiler tanks.

Dimensions/Weight

CVU15

Size	Dimensions (mm)			Dimensions (in)			Weight
	H	W	W1	H	W	W1	(kg)	(lb)
1/2”×1/8”	55	41	36	1.3	2.2	1.4	0,55	1.2
1/2”×1/2”	70				2.8

Specifications

Model	Connection		Max. operating pressure		Max. operating pressure differential		Max. operating temperature		Body material
Model	Type	Size	PMO(MPa)	PMO(psig)	(MPa)	(psig)	TMO(℃)	TMO(℉)	Body material
CVU15	Screwed PT	NPS1/2”×NPS1/2”	2,1	304.5	2,1	304.5	450	842	Stainless steel AISI304*

Maximum allowable pressure (PMA): 2,1MPa (305psig)PMA is the pressure that can be tolerated by pressure-resistant parts (body) .
Maximum allowable temperature (TMA): 450℃ (842℉)TMA is the temperature that can be tolerated by pressure-resistant parts (body).
Differential pressure of at least 0,5kPa (0.07psig) is required to open the valve.
*The DN15 screw standard enables connection with the JIS 15A screw standard.
*AISI: American Iron and Steel Institute
This product may occur steam leaks slightly from the air inlet connection because of metal-to-metal seals.
Please connect the pipe to air inlet connection and pull piping to a safe location when installing.

Air Intake Rate

Installation Examples

Operating Principle

Normal state
In a normal state, pressure P1 inside the line is applied to the connection, and the pressure P2 of the air intake is atmospheric pressure.
P1 is higher than P2 (P1>P2), and the valve is closed by this differential pressure.

Operating state
If the pressure in the line becomes negative, the pressure P1 at the connection becomes lower than the pressure P2 at the air intake (P1<P2).
The valve is opened by this differential pressure.
The valve is closed when the air flows in the line and the pressure in the line is increased. It will return back to Nomal state.