Oven gas valve - Thread Standard

Oven gas valve - Thread Standard
A threaded classification
1. thread since the beginning of two kinds of internal and external threads;
2. Press the tooth shape can be divided into: 1) triangular thread 2) trapezoidal thread 3) rectangle thread 4) serrated thread;
3. Press the line fractal single thread and multiple thread;
4. Press the right-hand thread screw-direction points and two left-hand thread, dextral not marked, plus L-LH, such as M24 × 1.5LH;
5. Press uses different points are: Metric common thread, threaded Gas Grill Control Valve thread sealing, non-threaded gas heater control valve thread sealing, 60 ° tapered pipe thread, Metric taper thread, etc.
Two Metric common thread
1. Metric common thread with a capital M, said tooth type angle 2α = 60 ° (α, said tooth-type half-width);
2. Metric common thread pitch divided by the common thread of two coarse thread and fine teeth;
2.1 coarse gas heater valve thread pitch mark is generally not indicated, such as M20, said coarse thread; fine thread pitch mark must be identified, such as M30 × 1.5 represents fine thread, where the pitch is 1.5.
2.2. The common thread for the connection between gas patio heater valve mechanical parts and fastening, multi-threaded connection generally coarse thread, than the same nominal diameter of coarse thread fine thread strength is slightly higher, better self-locking performance.
Mark 3. Metric ordinary thread: M20-6H, M20 × 1.5LH-6g-40, where M represents the common thread Metric, 20, said the thread Gas Heater Control Valve nominal diameter 20mm, 1.5 represents pitch, LH, said L, 6H, 6g, said thread accuracy class, upper class code represents precision internally threaded lower accuracy level code, said external thread, 40, said screwing length