For our general consumers, on the valve inlet pressure , outlet pressure , pressure hysteresis , pressure static characteristic curve , rubber parts performance, and so a system technology technical parameters it is impossible to test , so here, I just talk about some of the visual selection methods . [ English and valve above is the model number of representatives ] JYT home regulator ; Z represents the installation direction is vertical , and if no such letter was level ; D represents versatile ; 0.6 represents the rated flow , some manufacturers this traffic 1.2 may also be labeled as 0.6 ( cubic meters / hour ) ; behind the improved model is representative of manufacturers . Valve also called low pressure valve , the pressure relief valve on the relative terms , the standard name is a household bottled liquefied petroleum gas regulator, it applies to every family, and is closely related to our lives . [ Why use valve  Relatively high pressure cylinders , if straight to the stove, a stove flame will cause unstable combustion , two pressure cooker will produce directly connected to hidden dangers, in combustion prone to leaks, three large amounts of gas out a strong flame greatly waste of energy ( such a big flame completely unnecessary and incomplete combustion gases harmful ) .  Principle LPG regulator valves generally have less pusher lever valve and pressure relief valve . For lever valve , the gas through a pressure on the diaphragm valve , the diaphragm muster up , walk up the drive stem , stem and through the leverage to make a rubber pad pressed inside the outlet . Higher inlet pressure , the more tightly the weight of the rubber pad , forcing the outlet pressure decreases , resulting in a reduced effect. [ Installation ] valve a valve connected cylinders angle valve, thread for the m22 * 1.5lh, ie valve handwheel threads are left-hand thread . Tighten the hand wheel cylinder , the other end connected stove hose with wire interface tightened inspection vacuum tightness with soap , make sure there are no leaks before use. Adjustable pressure reducing valve industry standard adjustable pressure reducing valve is substandard products. However, the market share of adjustable pressure reducing valve can still be pricey . For normal use at full gas cylinder valve can be screwed from the smallest , played a decompression ; when the cylinder of the gas quickly exhausted , you can turn the knob to the maximum in order to ensure the outlet pressure and the pitcher gas exhausted. However, the actual operation, users often do not understand the operation, but can not guarantee adjustable pressure reducing valve outlet pressure and a range of other parameters meet the technical requirements , it is not recommended that you use adjustable pressure reducing valve . Adjustable pressure reducing valve for the domestic ban on the sale and use of products . [ With a table and explosion-proof type valve ] with forms and explosion-proof valve is usually manufacturers in order to meet consumer demand for the product , but with a table and explosion-proof type valve leak give more opportunities If you do not precise proof switch , pressure table shrapnel poor quality , this valve is not only unsafe to use , like a time bomb , constantly threatened our lives , so try to use less functional reducing valve, which is the most secure . [ See mark ] There should be a manufacturer of valves , trademarks, production license number, product model. National licensing system for valves , no production license number of the manufacturers have no right to relief valve production , and this is very harsh . Production licenses can check the Internet to verify the information is accurate. [ Instructions ] to see the standard instruction manual should have the product dimension , the basic parameters , simple to install and use, and with some safety precautions. Packing valve must see separate packaging. We see those who use plastic bags a packet Nachulaimai product is definitely substandard products. And in the box should have a standard specification , the box should have a production license number , performance standards, trademark, manufacturer , manufacturer contact information. If you buy FCL , but also to see whether the product name box , type, quantity, date of manufacture and other matters. Rejected three products . [ See structure ] should have a valve on the outlet of the housing , also called breathing hole is in line with the diaphragm out of gas while drilling . Breathing holes must be at the outlet side , if you see the other side of the breathing holes , it means the manufacturer even the most basic standards do not understand . This valve is absolutely unusable . Do not understand even this requires reducing valve manufacturer, other techniques I see basically no production targets , with such a valve, terrible . Surface treatment [ see ] valve surface treatment requirements to take law arbitrary vertical free fall from a meter high concrete does not produce performance from damage , in addition to internal performance , including surface treatment performance. We can not buy things when the valve so throw it, so we can look at the paint is solid. In the kitchen stove accessories corrosion of these are large, table processing impact on the service life of valve . [ See Material and weight ] some unscrupulous businesses will become the plastic casing on the relief valve , which is simply a joke to take the lives of the people , although the main pressure relief valve in the lower case , but the seal on the housing needs and the lower case with , if the upper housing is plastic, the sealing performance is likely to cause an accident . The material should be yl102 valve aluminum alloy or zinc alloy , plastic housing of the valve if it is determined not to buy , not petty stuffed a disaster. When we buy a regulator valve can weigh about the weight too light not to buy. If not the plastic body, but the wall is too thin valve also prone to leakage. We press aluminum 20,000 yuan / ton, a 200 g reducing valve should be in the light material costs 4 dollars or so, of course , the actual material and labor costs far more than this number , a lot of the actual costs incurred are not considered inside, such as rubber parts, plastic parts , screws, nuts and other metal parts , springs, other components , materials , packaging, machine wear and tear , mechanical mold maintenance , fuel consumption , scrap loss , labor costs , utilities apportion apportion administrative costs , marketing costs, freight, taxes, profits until , etc., these are the price of the product . In addition, the valve wholesalers comrades should also look at least split the internal structure of a pressure reducing valve if there are problems , split -off valve absolutely want to throw away or return the original , absolutely can not sell out , remember. [ Flames ] Some people think bigger is better if the relief valve flames bigger the better, this is a big mistake . If the flame is too large , a pressure reducing valve will not play the role ; too small and can not meet the needs cooker . So, we see stove valve installed in the combustion flame should be moderate, stable