1. Water Heater Gas Valves, the valve should be visually, the surface should be no trachoma; plated surface should be uniform gloss shall watch for peeling, cracking, burning, exposed bottom, peeling, dark spots and obvious defects such as pitting; spraying surface tissue should fine, smooth and uniform, without sagging, open at the end and other defects. The defect will directly affect the life of the valve.
2.Gas Valves pipe thread is connected with the pipeline, in the purchase of visual thread whether the surface dents, broken teeth and other obvious defects, with particular attention to the pipe thread and connector screwed effective length will affect the seal of reliable sex, pay attention to the effective length of pipe thread when purchasing. Generally cylindrical pipe thread DN15 effective length of about 10mm.
3. The valve, ball valve is generally on their body or handle marked with nominal pressure, can choose according to their needs when purchasing.
4. Replace the existing gate or ball, you want to find out the length of the structure, so can not be installed after purchase.
Pipe thread 5. Triangle valve has two internal thread and external thread, to choose according to needs; also note that there are some triangular zinc alloy valve on the market today, the valve is priced lower than the average product, but corrosive and cause breakage.
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