Rising stem gate valve
Turning the handwheel, through the advance and retreat of the thread of the handwheel and the valve stem, lifts or lowers the valve plate connected with the valve stem to achieve the function of opening and closing.
Dark stem gate valve
Dark stem gate valve is also called rotating stem gate valve (also called dark stem wedge gate valve). The valve stem nut is set on the gate, and the rotation of the handwheel drives the valve stem to rotate, which makes the gate lift. Usually, there is a trapezoidal thread at the bottom end of the valve stem. Through the thread at the bottom end of the valve and the guide groove on the disc, the rotary motion is It becomes linear motion, that is, the operating torque becomes the operating thrust.
Gate valve manufacturers
The difference between the working principle of dark stem gate valve and rising stem gate valve:
1. The lifting screw of the flanged gate valve only rotates without moving up and down. Only a rod is exposed, and its nut is fixed on the gate. The gate is lifted by the rotation of the screw, and there is no visible gantry. ;The lifting screw of the rising stem flange gate valve is exposed, and the nut is close to the handwheel and is fixed (not rotating or moving axially). The gate is lifted by rotating the screw. There is no relative axial displacement, and the appearance is a portal bracket.
2. The dark rod valve can not see the lead screw, and the open rod can see the lead screw.
3. When the dark stem valve is switched on and off, the steering wheel and the valve stem are connected together and are relatively stationary. It is opened and closed by the valve stem rotating at a fixed point to drive the valve disc to lift up and lower the gate to complete the opening and closing. The rising stem valve lifts or lowers the valve disc through the threaded transmission of the valve stem and the steering wheel. To put it simply, the rising stem valve is a valve disc connected to the valve stem to move up and down together, and the steering wheel is always at a fixed point.
Brief introduction of gate valve manufacturers:
Gate valve is one of the most widely used valves on the market. According to the type, it can be divided into open stem gate valve and dark stem gate valve. Let me talk about the working principle, advantages and disadvantages and differences of use between the two.
Rising stem gate valve, the common models are Z41H-10, Z41H-16 and so on.
Working principle: The valve stem of the gate valve drives the gate up and down, the valve stem is outside the valve body, and the drive thread of the valve stem can be seen, and the opening and closing and position of the gate can be judged intuitively according to the movement direction and position of the valve stem;
Advantages: The stem drive thread is easy to lubricate and is not corroded by fluid impact;
Disadvantages: It requires a large installation space. Because the valve stem is exposed and susceptible to corrosion, it cannot be installed underground in principle.
Concealed stem gate valve, the common models are Z45X-10, Z45X-16 and so on.
Working principle: The transmission thread of the dark stem gate valve is located inside the valve body. During the opening and closing process, the valve stem only rotates and the gate plate rises and falls in the valve body. Therefore, the height dimension of the valve is small.
Advantages: Due to the relatively small height dimension of the dark stem gate valve and the valve stem located inside the valve body, it can be used in environments with small space and high dust content such as ships and pipe trenches.
Disadvantages: It is impossible to observe the opening and closing and approximate position of the gate from the appearance, and the maintenance and repair are also cumbersome;
Summary: Gate valves are selected according to different working conditions. Dark stem gate valves are suitable for outdoor exposed occasions or underground places that are prone to moisture and rust. When indoor pipeline space is large and frequent switching and maintenance are required, open stem gate valves are selected, which can be easily disassembled. Lubrication maintenance.
Gate valve manufacturers
Liaoning Yuanlu Machinery Equipment Manufacturing Co., Ltd. is a Taiwanese-invested enterprise that develops and manufactures water supply and drainage valves, industrial valves and their automatic control systems and environmental protection equipment. The main products are gate valve, globe valve, ball valve, butterfly valve, check valve, regulating valve, etc. 12 categories, more than 200 series, more than 4000 specifications, widely used in petroleum, petrochemical, chemical, electric power, metallurgy, water conservancy, medicine, Municipal construction, water supply and drainage and other fields of the national economy.
Tel: 133-3231-9780