YJ tupe one-way shock absorber is a kind of drilling tool which effects shock absorption by depending on hydraulicoil under external force through elastic deformation and damping. With some features of simple construction, easy and reliable operation, it can fully overcome the impact and shocking load from drill strings during drilling operation. Taking use of the shock absorber, it can raise the service life for drill bit and drill tool, speed up drilling, get rid of drilling jumping, well protect surface equipments and drilling tools. Thechnical specifications and parametersType O.D.(mm) I.D.(mm) Max.stroke(mm) Max.bitweight(KN) Tensile strength(KN) Ambienttemperature(°C) Threadconn. Pull-downoverallength(mm) SeallingPressureMpa YJ121B 121 38 121 265 1000 -40~150 3 1/2"REG 3950 30 YJ160B 160 45 120 343 1500 -40~150 NC46 4100 30 YJ178B 178 57 125 392 1500 -40~150 NC50 3845 30 YJ203B 203 64 150 490 2000 -40~150 6 5/8"REG 4045 30 YJ229B 229 70 150 539 2000 -40~150 7 5/8"REG 3800 30
