LFH-I American standard breathing valveDetailed product description：

Overview of LFH-I American standard breathing valve:
The LFH-I American standard breathing valve is used on oil and liquid tanks to eliminate positive and negative pressure gases inside the tank, making it convenient for liquid to enter and exit the tank If there is no breathing valve installed on the tank, there may be certain obstacles to the entry and exit of liquid in the tank, which may lead to tank deformation and vibration. This product is designed reasonably, has a simple structure, and is easy to use; It is an essential product for storage tanks and indispensable.

Performance and characteristics of LFH-I American standard breathing valve:
The new all-weather breathing valve housing is made of cast iron, cast steel, and aluminum alloy, with good corrosion resistance;
The valve disc is made of PTFE material, which is resistant to low temperatures and has good anti freezing performance;
• Simple structure, easy maintenance, safe and convenient;
The performance of the new all-weather breathing valve fully complies with the standard SY7511-87 of the Ministry of Petroleum Industry.

Application scope of LFH-I American standard breathing valve:
The new all-weather breathing valve is suitable for storing Class A oil products with a flash point below 28 ℃ and Class B oil products with a flash point below 60 ℃, such as gasoline, benzene, benzene, kerosene, light diesel, engine oil, crude oil, and chemical product storage tanks with the same properties.
Can be used in conjunction with new corrugated flame arresters.

Instructions for using LFH-I American standard breathing valve:
The breathing valve is installed at the top of the storage tank to solve the problem of positive and negative pressure gas inside the tank, so that the liquid in and out of the tank is not obstructed. When the external liquid is input into the tank, a large amount of gas is exhaled (called positive pressure). When the liquid inside the tank is exported, it must be sucked into the tank from the outside air (called negative pressure). If the breathing valve automatically closes when the work stops, it will not leak the liquid and gas inside the tank, which ensures the quality of the liquid inside the tank.

Maintenance and upkeep of LFH-I American standard breathing valve:
For the safety of using the breathing valve, check whether the guide rod and valve disc are flexible before use.
This valve should be checked regularly (within 6 months) to ensure that the positive and negative valve discs of the ventilation port are flexible, and that the contact surface of the valve disc is not damaged. If there is any damage, it should be repaired immediately. After the maintenance is completed, everything is normal and can be reused.

Main technical parameters of LFH-I American standard breathing valve:
Main technical parameters of LFH-I American standard breathing valve:

A-grade positive pressure	355Pa 36mm water column
negative pressure	295Pa 30mm water column
B-level positive pressure	980Pa 100mm water column
negative pressure	295Pa 30mm water column
C-level positive pressure	1765Pa 180mm water column
negative pressure	295Pa 30mm water column

LFH-I American standard breathing valve component materials:

Valve body material	Carbon steel WCB, stainless steel 304, 316, aluminum alloy
Positive pressure valve disc material	Stainless steel 304, 316, aluminum alloy
Negative pressure valve disc material	Stainless steel 304, 316, PTFE PTFE
Environmental temperature ℃	-30~60

LFH-I type American standard breathing valve American standard flange connection external dimensions: ANSI, API, ASME available for JIS standards

American standard breathing valve specifications	Installation dimensions of American standard breathing valve (mm)
	D1	D	D3	H	M-h
1"	seventy-nine point five	one hundred and eight	one hundred and fifteen	one hundred and eighty	4×15
2"	one hundred and twenty point five	one hundred and fifty-two	one hundred and sixty	two hundred and fifty-five	4×19
3"	one hundred and fifty-two point five	one hundred and ninety	two hundred and thirteen	two hundred and sixty	4×19
4"	one hundred and ninety point five	two hundred and twenty-nine	two hundred and sixty-five	two hundred and ninety	8×19
6"	two hundred and forty-one point five	two hundred and fifty-four	three hundred and five	three hundred and thirty	8×22
8"	two hundred and ninety-eight point five	three hundred and forty-three	three hundred and fifty-five	three hundred and fifty	8×22
10"	three hundred and sixty-two	four hundred and six	four hundred and twenty	four hundred	12×25