Hx2, Hxf2 with Nozzle Breathing Valve

• Media: Water
• Standard: Water Vapour Oil
• Certification: CCC, RoHS, ISO, CE
• Temperature: High Temperature
• Connection: Flange
• Valve Seat: Double-Seat
• Model NO.: HX2, HXF2
• Structure: Piston
• Material: Cast Iron
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: XC
• Origin: China
• HS Code: 8421219990
• Production Capacity: 9999

Product Description

 

Product Name:	Breathing valve with double nozzle	Product Model:	HX2, HXF2
Nominal diameter:	DN40 to DN250	Structural form:	Double nozzle
Nominal pressure:	1.6MPa to 2.5MPa	Connection method:	Flange
Applicable temperature:	-28ºC to +60ºC	Installation position:	Top of storage tank
Body material:	Cast steel, stainless steel	Manufacturing standard:	GB, German DIN, American API, ANSI
Applicable media:	Gasoline, diesel, kerosene, crude oil, toluene, etc	Manufacturer:	Xuan Cheng Valve Co., LTD

Product Description

HX2, HXF2 with double nozzle breathing valve is to maintain the tank pressure balance, reduce the medium volatilization safety and energy saving products. The double nozzle breathing valve is an indispensable main safety equipment on the fixed roof storage tank of crude oil, gasoline, kerosene, light diesel oil, aromatics, etc. It can prevent evaporation loss and protect the storage tank from damage when it is under overpressure or vacuum.

Product Specification

According to the national standard "Design fire protection Code for petrochemical enterprises" (GB50160-92) provisions: "The fixed top tank for storing class A and B liquids should be equipped with flame arrester and breathing valve". There are many varieties of breathing valve, each has its different performance and characteristics, in the selection should be in accordance with its characteristics to meet the conditions, whether it can achieve the best operating effect, and then consider some objective factors. With double nozzle breathing valve is one of the popular products in the market, with double nozzle breathing valve plays a safety protection role in the system. In practical application, its characteristic type should be selected according to actual needs, and its diameter should be selected as the best scheme according to the maximum exhaust volume. The breather valve with double nozzle (fire resistance) is a new improved breather valve, which sets the double function of the breather valve and the storage tank flame arrester.

Product function

HX2, HXF2 with double nozzle breathing valve is installed on the fixed top tank ventilation and fire resistance device, can play a role in reducing oil evaporation loss, control tank pressure balance and control flame. The breathing valve is equipped with an electrostatic protection device, which makes the valve maintain the same potential with the tank at all times. With double nozzle (fire resistance) breathing valve is also suitable for recoverable gas storage tank, such as nitrogen capped storage tank, it can directly inhale nitrogen from the nitrogen tank, can also be connected to the waste nitrogen recovery in the storage tank, really achieve high efficiency, energy saving, environmental protection. With double nozzle (fire resistance) breathing valve also has the function of automatically regulating the pressure inside and outside the storage tank, and the valve can replace the nitrogen sealing device.

Product Features

HX2, HXF2 with double nozzle breathing valve disc made of PTFE material, low temperature resistance, good anti-freeze performance; The fire block disc is made of stainless steel with excellent fire resistance performance. The shell is made of stainless steel, cast steel and aluminum alloy, with compact structure, strong fire resistance, large ventilation, small leakage, corrosion resistance, low temperature resistance, frost resistance, easy maintenance, safety and convenience.

Main parts

Model number	HXF2	Specifications	DN40-DN250 PN0.6-PN2.5
Shell material	AL CS 304 316 316L	Guide bar material	AL 304 316 316L
Nut bolt	CS 304 316 316L	Sealing gasket	Graphite gasket Metal gasket tef-lon
Positive pressure valve disc material	CS 304 316 316L/F4	Negative pressure valve disc material	Tef-lon F4
Positive pressure valve disc pressure	+36mmH2O +1000mmH2O	Negative pressure valve disc pressure	-25mmH2O -65mmH2O
Pressure rating	Grade A Grade B Grade C grade D grade	Ambient temperature	CS:-30ºC~+350ºCSS:-80ºC~+350ºC
Connection method	Flange connection threaded connection	Flange standard	JB GB HG ANSI SH JIS
Design and manufacture inspection standards	SY/T0511-1996 GB5908-86	Exterior Treatment	CS: paint SS:NO Paint

Outline structure drawing

 

Main overall dimensions

DN	40	50	80	100	150	200	250
H1	95	120	135	145	155	165	190
H2	220	235	275	320	375	440	495
H	330	350	410	450	585	695	770
L	245	255	350	365	490	550	590

Installation Maintenance

1. The breathing valve with double nozzle is installed at the highest point of the oil storage tank to reduce the evaporation loss of materials and maintain the air pressure balance inside and outside the storage tank. General vertical oil tank, the breathing valve is installed in the central range of the oil tank roof; For storage tanks with heat insulation layer on the tank top, the breathing valve can be installed near the ladder platform.
2, with double nozzle breathing valve factory, flange sealing surface using plastic protective cover, so as not to cause damage to the flange sealing surface during transportation, when the goods to the site installation, be sure to remove the flange protective cover, and then vertically installed on the top of the storage tank. The breathing valve can not be placed horizontally and inverted. If two breathing valves need to be installed at the top of the storage tank, the breathing valve and the center of the tank top should be installed symmetrically.
3, with double nozzle breathing valve installed on the storage tank is generally used for 1-3 months, it is necessary to regularly check the breathing valve positive and negative pressure valve disc work is flexible, breathing valve in normal work, will emit "suction suction" pressure relief exhaust sound, otherwise, need to open the valve cover on the top of the breathing valve, check whether the breathing valve disc appears "chuck" phenomenon. Whether there is dirt on the guide rod, if there is timely clean up the dirt, to ensure that the guide rod runs freely. Whether the sealing surface of the valve seat is worn, if it is worn, it should be replaced immediately to ensure the normal and safe operation of the breathing valve.
4. The positive and negative pressure valve disc with double nozzle breathing valve is constantly changing and moving up and down according to the rise and fall of the pressure in the tank. When the breathing valve is used for three years, it is generally necessary to replace the valve disc, guide rod and sealing surface of the valve seat inside the breathing valve to ensure the normal work of the breathing valve and maintain the safe operation of the storage tank.