Qzf-89 Pressure Vacuum Relief Valve with Flame Arrester

QZF-89 Pressure Vacuum Relief Valve With Flame ArresterModel QZF-89 is designed to vent to atmospheric to protect your tank from damage created by over-pressure or excessive vacuum.The flame arrestor performs as an extinguishing barrier,which absorbs and dispels heat,reduces fire temperature and the oxyen level to stop the fire through layers of metal ribbons shaped with crimped corrugations.FunctionBreathing valve is a pressure balance, reduce the maintenance tank safety energy-saving products medium volatile, widely used in petrochemical storage and transportation equipment industry. Breathing valve of traditional structural design is simple, because no set quick opening device, cleaning and maintenance is not convenient; because of long time service in low temperature environment, the valve port is very easy to freeze, and breathing between the valve and the tank is easy to produce the potential due to the poor.Operating pressure:Type A: +355pa(+36mmH2O) -295pa(-30mmH2O)Type B: +980pa(+100mmH2O) -295pa(-30mmH2O)Type C: +1970pa(+200mmH2O) -295pa(-30mmH2O)Type D:  according to user requirement (special pressure rating) Note: under normal circumstances, (fire) breathing valve operating pressure to B shall prevail; Applicable materials: gasoline, kerosene, diesel, aromatics, sulfur, air and other petrochemical materials; Environment temperature-40 ºC -+60 ºC; Shell material: HT, AL, A3, 18-8, 304, 304L, 316, 316L. Flange standards: HG20592-97 PN1.0 (also can be produced according to user specified criteria)PROCUCT:CASTING  FAQ: 1. What is your MOQ?Our MOQ is usually 5 CTNS.2. What is your delievery time?Our delievery is about 25-30days.3. What is your payment terms?We accept T/T, 100% L/C, or West Union and so on.4. Could you provide free samples?Usually, we offer free samples, customers bear freight cost. 5. Why choose us?Firstly, comparing with many factories, our prices are more competitive.Secondly, We 100% test working pressure for ALL our products.Finally, After- Services will be highly satisfied. Any problems and feedbacks will be responded efficiently./* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1