Product introduction of floating soft-sealed ball valve

Overview

Floating soft-sealed ball valve, also known as floating soft-sealed ball valve, floating ball valve, and soft-sealed floating ball valve, usually adopts a cast steel or stainless steel valve body, a floating ball structure, and uses soft sealing materials such as PTFE or PPL. It can be used in various pipelines of Class150~Class1500, PN16~PN63, and JIS10K~JIS20K to cut off or connect the medium in the pipeline. By selecting different materials, it can be respectively suitable for various media such as water, steam, oil, liquefied gas, natural gas, coal gas, nitric acid, acetic acid, oxidizing media, and urea.

Product features

1. Low flow resistance: Among various valves, the ball valve has the lowest flow resistance. When a full-bore ball valve is opened, the passage of the ball, the passage of the valve body, and the diameter of the connecting pipe are equal and form a single diameter, allowing the medium to flow through with almost no loss.

2. Quick opening and closing: The ball valve can be fully closed or fully opened by rotating 90°. Compared with gate valves and globe valves of the same specification, the ball valve is smaller in volume and lighter in weight, which facilitates pipeline installation.

3. Good sealing performance: The seat sealing ring is generally made of elastic materials such as polytetrafluoroethylene, which is easy to seal. Moreover, the sealing force of the ball valve increases with the increase of the medium pressure. At the same time, the valve stem only rotates when the ball valve opens and closes. Therefore, the packing seal of the valve stem is not easily damaged, and the sealing force of the back seal of the valve stem also increases with the increase of the medium pressure.

4. Easy for automatic control: The opening and closing of the ball valve only require a 90° rotation, so it is easy to achieve automatic control and remote control. It can be equipped with pneumatic devices, electric devices, hydraulic devices, pneumatic-hydraulic linkage devices or electro-hydraulic linkage devices.

5. Media is not easy to deposit: The passage of the ball valve is flat and smooth, making it difficult for the media to deposit. Pipeline pigging can be carried out.

Performance parameters

Commonly applicable parameters

|Components|Applicable materials|

| —- | —- |

|Valve body, valve cover|Carbon steel, cast steel, chromium-nickel stainless steel|

|Sphere, valve stem|Chromium/chromium-nickel/chromium-nickel-molybdenum series stainless steel, chromium-nickel series stainless steel|

|Sealing ring|Flexible graphite gasket / 316 + Flexible graphite gasket|

|Filler|Polytetrafluoroethylene|

Parameters to be confirmed for model selection

1. Fluid medium: It includes water (such as tap water, hot water, heating water, drinking water, factory sewage, urban sewage, and some acidic and alkaline chemical water) and gases (such as air, nitrogen, compressed air, oxygen, liquefied gas, natural gas, coal gas, etc.).

2. Pipe Diameter: The nominal diameter refers to the nominal diameter at the connection between the valve and the pipe, which is represented by “DN” and a number. For example, “DN150” indicates that the nominal diameter of the valve is 150 mm. Generally, the calibers range from DN1 to DN1000.

3. Medium temperature: It is usually divided into three ranges: low temperature, normal temperature, medium temperature, and high temperature.

注：原文本表述“三个范围”但列举了四个，从逻辑上存在问题，翻译按原文如实呈现。若要使逻辑合理，可修改原文为“通常分为低温、常温、中温三个范围” ，对应英文为 “It is usually divided into three ranges: low temperature, normal temperature, and medium temperature.”

4. Nominal Pressure: It refers to the design – given pressure related to the mechanical strength of the valve. It is the maximum allowable working pressure of the valve at the reference temperature, and is represented by “PN” and a number. For example, PN1.6 means that the valve’s bearing capacity is 1.6 MPa. Common ones include 1.6 MPa, 2.5 MPa, 4.0 MPa, 6.4 MPa, 10 MPa, 16 MPa, 25 MPa, 32 MPa, 50 MPa, etc. In the American standard, there are 150 LB, 300 LB, 600 LB, 800 LB, 900 LB, 1500 LB, 2500 LB.

5. Connection methods: Different usage scenarios may require different connection methods.

6. Valve body material: Generally, there are cast iron, ductile iron, cast steel, stainless steel 304, 316, 304L, 316L; CF3, CF8, CF3M, CF8M, etc.

7. Sealing materials: Generally, there are soft seals and hard seals. The soft seals are made of rubber and PTFE, while the hard seals are usually made of stainless steel and hard alloy.

8. Power supply: If it is a solenoid valve or an electric valve, the power supply voltage needs to be known. Generally, there are DC12V, DC24V, AC220V, and AC380V.

9. Input and output signals: For regulating valves, it is also necessary to know the input and output signals, mainly including voltage frequency pulse output, two-wire 4 – 20mA output, and HART output. In addition, digital output may be required in some occasions, and modbus RS485 communication can also be provided.

Industry applications

Floating soft-sealed ball valves are widely used in multiple industrial fields, such as water conservancy, municipal engineering, power plants, chemical industry, petroleum, mining, liquefied natural gas, steam, food, pharmaceuticals, etc. For example, in addition to controlling gas, liquid, and steam media, the Q941F floating soft-sealed electric flange ball valve is also suitable for controlling sewage and media containing fibrous impurities, and is often used in occasions with strict sealing requirements.

Examples of some products

The Q41F type PN16 – PN63 floating soft – sealed ball valves produced by Zhejiang Shangou Valve are suitable for working pressures ranging from 1.6 to 2.5 MPa and applicable temperatures ≤ 180℃. They can be used for water, steam, oil products, weakly corrosive media, etc. The product also provides information such as the main connection dimensions and weights under different nominal diameters.