A gate valve is a valve that uses a gate as an opening and closing member to move up and down vertically along the axis of the valve seat to achieve opening and closing actions. The main advantages of gate valves are smooth flow channels, low fluid resistance, and low opening and closing torque; The main disadvantages are that the sealing surface is prone to scratches, the opening and closing time is long, and the body shape and weight are large. Zhejiang Shanliu Valve Technology mainly produces rising stem gate valves, concealed stem gate valves, soft seal gate valves, fire gate valves, signal gate valves, groove gate valves, stainless steel gate valves, electric gate valves, hydraulic gate valves, bevel gear gate valves, elastic seat seal gate valves, double gate gate valves, brass gate valves, API American standard gate valves, pneumatic gate valves and other products. The characteristic of a rising stem gate valve is that the valve stem drives the gate to rise and fall together, and the transmission thread on the valve stem is exposed to the outside of the valve body. Therefore, the opening and closing position of the valve can be intuitively determined based on the direction and position of the valve stem movement. Moreover, the transmission thread is easy to lubricate and not corroded by fluids, but it requires a large installation space. On the contrary, the transmission thread of the concealed stem gate valve is located inside the valve body, and during the opening and closing process, the valve stem only rotates without moving (the gate moves up and down inside the valve body). Therefore, when the valve is opened, the height dimension of the valve is small, requiring only a small installation space. Hidden stem gate valves are usually equipped with switch position indicators above the valve cover, which are suitable for environments with small spaces and high dust content such as ships and pipe trenches.

Butterfly valve is a valve that uses a circular butterfly plate as the opening and closing element and rotates with the valve stem to achieve the opening and closing action. It has the advantages of simple design structure, fast opening and closing, small pipeline area occupation, light weight, and small opening and closing torque. Zhejiang Shanliu Valve Technology produces various types of soft sealed butterfly valves, clamp butterfly valves, flange butterfly valves, triple eccentric butterfly valves, double eccentric butterfly valves, multi-level hard sealed butterfly valves, groove butterfly valves (clamp butterfly valves), welded butterfly valves, worm gear butterfly valves, electric butterfly valves, pneumatic butterfly valves, hydraulic butterfly valves, and PTFE sealed butterfly valves, which can be designed with functions of cutoff, adjustment, or both cutoff and adjustment according to different sealing requirements of the butterfly valves. The butterfly plate of butterfly valves has various structures, mainly including midline butterfly valves and eccentric butterfly valves. The main difference between the center line butterfly valve and the eccentric butterfly valve lies in the position of the valve stem. The fluid resistance of the center symmetrical plate is relatively small, but the sealing surface is prone to abrasion and leakage, so it is mostly used for flow regulation; The sealing performance of the inclined plate is good, but it is difficult to process; The sealing performance of the offset plate is also good, and it is easy to process and maintain, but the fluid resistance is relatively high. The following product images are for selection reference only.

Air valve is a device used to discharge gas from pipelines and suck external air into pipelines when the pipeline is under negative pressure. It is widely used in pipeline systems such as water supply pipelines, independent heating systems, central heating systems, heating boilers, central air conditioning, floor heating, and solar heating in urban water plants. The main working principle and function of the exhaust valve are to prevent gas accumulation in the pipeline, improve the efficiency of pipeline use and reduce energy consumption, and to resist water hammer and other effects when the water pump suddenly stops. When the pipeline is under negative pressure, the suction valve will suck in air to prevent damage to the pipeline when it is subjected to negative pressure again. Zhejiang Shanliu Valve Technology produces a wide variety of air valves, including anti water hammer air valves, waterproof hammer air valves, three-stage air valves, micro exhaust valves, high-speed exhaust valves, composite exhaust valves, steam injection micro exhaust valves, three hole ventilation valves, intelligent air valves, suction valves, power inlet and outlet valves, single hole air valves, double hole air valves, etc.

Pressure reducing valves are mainly used in industrial pipeline systems such as water, oil, steam, hydrogen, oxygen, nitrogen, argon, etc. Their main function is to manually or automatically reduce pressure and maintain a certain set pressure value at the pipeline outlet. It can stably ensure that the outlet pressure is automatically maintained within the specified range. The pressure reducing valves produced by Zhejiang Shanliu Valve Technology mainly include pilot operated pressure reducing valves, piston pressure reducing valves, diaphragm pressure reducing valves, pressure stabilizing pressure reducing valves, differential pressure reducing valves, back pressure reducing valves, two-stage pressure reducing valves, water pressure reducing valves, steam pressure reducing valves, gas pressure reducing valves, air pressure reducing valves, gas pressure reducing valves, oxygen pressure reducing valves, etc. The pressure reducing valves are suitable for pressure reduction and stabilization of various water and industrial pipelines, and also have the characteristics of low friction and high sensitivity.

A check valve is a one-way valve that can automatically prevent fluid backflow, also known as a one-way valve. Usually, fluid under pressure causes the valve disc of the valve to open and flow from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc automatically closes the channel under the action of fluid pressure and its own gravity, preventing fluid backflow from causing damage to the equipment in front of the valve. The valve body of lift check valves is often similar to that of globe valves, with high fluid resistance. These types of check valves are high-pressure small-diameter and often use spherical valve discs. Swing check valves have low resistance to fluids and are generally suitable for small and medium-sized, low-pressure, and large-diameter pipelines. The shape of butterfly check valve is similar to that of butterfly valve, with single and double lobes. It has a simple structure and low resistance to fluids. Pipelines that are prone to water hammer can use micro resistance slow closing check valves with buffering function to extend the closing time, slow down the speed caused by water hammer, and avoid damage to the valve front equipment caused by water hammer. Zhejiang Shanliu Valve Technology produces various types of rotary check valves, lift and drop check valves, double disc butterfly check valves, clamp check valves, ball check valves, axial flow check valves, inclined disc check valves, globe check valves, flange check valves, silent check valves, soundproof check valves, micro resistance slow closing check valves, etc.

Water supply and drainage valves are indispensable control equipment in municipal water supply, sewage treatment, building fire protection, and industrial circulating water systems. They are mainly used to regulate or cut off the flow of media in pipelines. Common types include gate valves, butterfly valves, check valves, ball valves, globe valves, and air release valves. In water supply systems, valves need to feature good sealing performance, low flow resistance, and easy operation. Automatic control technology is becoming increasingly popular in the field of water supply and drainage. Electric and pneumatic valves enable remote control and intelligent management, significantly improving the response efficiency of water supply dispatching and flood control and drainage. There is a wide variety of water supply and drainage valves. In addition to the already categorized series of valves, Zhejiang Shanliu Valve Technology also produces: top-entry eccentric hemispherical valves, fully welded ball valves, fully welded strainer ball valves, flow control and pressure reducing valves, balancing valves, IoT valves (unit valves), high-performance static balancing valves, high-performance dynamic balancing valves, mud discharge valves, air release valves, backflow preventers, water hammer arresters, explosion-proof safety valves, strainers, flow regulating valves, differential pressure regulating valves, hydraulic control valves, and other water supply and drainage valves.

Industrial valves are key actuating devices in industrial fluid control systems, used for precise adjustment and control of medium on/off, flow rate, pressure, and flow direction in pipelines. They are not just simple mechanical components but core piping equipment that ensures the safety, efficiency, and energy savings of industrial processes. The main products include shut-off valves (such as ball valves, globe valves, plug valves), control valves, steam traps, safety valves, forged steel valves, cryogenic valves, liquid cooling valves, etc. Actuation methods include manual, electric, pneumatic, hydraulic, etc. The industrial valve production standards of Zhejiang Shanliu Valve Technology can be customized according to user requirements to produce API American standards, EN European standards, JIS Japanese standards, GOST Russian standards, DIN German standards, and GB Chinese national standards, adapting to design specifications for different global markets. They are widely used in all industrial fields involving fluids, such as petroleum, chemical, gas, pharmaceutical, electric power, data centers, etc.