Internal thread waist drum type plunger valve UJ11Y (H) U11SM, internal thread connection is divided into non-metallic seal, metal seal two categories, in addition, the external thread connection plunger valve its shape is divided into Z-shaped plunger valve and waist drum plunger valve two categories, its internal structure is exactly the same, the use is the same, mainly used in metallurgy, electricity, chemical, refining, food and other industries. The pressure is within 16-25kgf/cm2, and the temperature is below 250 °C for opening and closing small diameter pipelines such as water, steam, oil and other small diameter pipelines for opening and closing to adjust the flow.