Rising Stem Flat Gate Valve

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Technical Specification
Product name	Rising stem flat gate valve
Design reference	API	ASME
Design standard	API 6D	ASME B16.34
Structural length	API 6D	ASME B16.10
Flanged ends	ASME B16.5、ASME B16.47	ASME B16.5、ASME B16.47
Butt-welding ends	ASME B 16.25	ASME B 16.25
Test & inspection	API 6D	API598
Packing:	To be packed in suitable wooden cases as per client's option or customized
Shipping & Delivery:	20-25 days lead time; deliver by ship from Ningbo port or Shanghai port
Notes: Serial valve connecting flange and butt-welding terminal size can be designed at customers'request. The material of the main parts and sealing surface of the valve can be designed and selected according to the actual working conditions or the special requirements of users.

 

 

1. It has the advantages of simple and compact structure, reasonable design, reliable sealing, light and flexible operation, small size, smooth channel, low resistance, easy installation and easy disassembly.

2. When the valve is fully opened, the flow resistance coefficient is very small, and the valve will eliminate the function of the valve disc and the dirt on the sealing surface every time the valve is opened and closed.

3. The packing is made of flexible graphite ring and graphite packing, reliable sealing, light and flexible operation.

4. It is widely used in oil and water steam pipelines such as petrochemical industry and thermal power plants to connect or cut off the intermediate quality of pipelines. The sealing surface of the opening and closing device has compact structure and reasonable design.

 

 

• Our service tenet is customer first, service first. We will provide more accurate and efficient manufacturing and service according to customer requirements.
• We have a professional QC team to ensure that the products in Rising stem flat gate valve meet your needs and do better.
• Check raw materials before production at Rising stem flat gate valve.
• Spot checks are carried out during the processing of Rising stem flat gate valve.
• 100% inspection of Rising stem flat gate valve before shipment.
• Provide a one-year service for the products provided by Rising stem flat gate valve to create value for customers.

 

 

• We have complete production technology and management.
• As a manufacturer our price is also good.

 

 

To be packed in suitable wooden cases as per client's

 

 

Q: How to judge the opening and closing of gate valve?

A: 1. The judgment of the position of the pole

The open rod is the control rod for opening and closing the gate valve, and its position can reflect the open state of the gate valve. Generally speaking, when the light rod is upright, it means that the gate valve is closed; When the lever is horizontal to the left or right, it means that the gate valve is in a half-open state; When the shaft is straight down, it means that the gate valve is fully open. Therefore, observing the position of the rod can initially understand the opening state of the gate valve.

 

2. The judgment of pipeline flow direction

The opening state of the gate valve is also related to the flow direction of the pipeline. When the pipeline flow direction is consistent with the direction of the valve, the gate valve is in the open state; When the pipeline flow direction is perpendicular to the valve direction, the gate valve is closed. Therefore, the open state of the gate valve can be judged by observing the flow direction of the pipeline.

 

3. Other methods of judgment

In addition to the above two methods, you can also judge the opening state of the gate valve by observing the pressure gauge, thermometer and other equipment. When the gate valve is closed, the reading of the pressure gauge and thermometer are zero; When the gate valve is open, the reading of the pressure gauge and thermometer changes.

In general, judging whether the gate valve is open or closed requires a variety of understanding and judgment, in addition to observing the position of the gate and the flow of the pipeline, it can also be judged by other equipment. In practical application, comprehensive judgment should be made according to the specific situation.

 

Q: What are the factors that affect gasket and packing seal?

A: There are mainly seven factors affecting the sealing of gaskets and packing.

① The surface condition of the sealing surface: the shape and surface roughness of the sealing surface have a certain effect on the sealing property, and the smooth surface is conducive to sealing. The soft gasket is not sensitive to the surface condition because of its easy deformation, and the surface condition has a great influence on the hard gasket.

 

② The contact width of the sealing surface: the greater the contact width between the sealing surface and the gasket or packing, the longer the path required for fluid leakage and the greater the flow resistance loss, which is conducive to sealing. However, under the same compression force, the larger the contact width, the specific sealing pressure will decrease. Therefore, it is necessary to seek the appropriate contact width according to the material condition of the seal.

 

③ Fluid properties: the viscosity of the fluid has a great impact on the sealing of the packing and gasket, and the fluid with large viscosity is easy to seal due to its poor fluidity. The viscosity of liquid is much greater than that of gas, so liquid is easier to seal than gas.

Saturated steam is easier to seal than superheated steam because it will condense droplets and block the leakage channel between sealing surfaces. The larger the molecular volume of the fluid, the easier it is to be blocked by the narrow sealing gap, and thus easy to seal.

The wettability of the liquid to the sealing material also has a certain effect on the sealing. The liquid that is easy to infiltrate is prone to seepage leakage due to the capillary action of the micropores inside the gasket and packing.

 

④ The temperature of the fluid: the temperature affects the viscosity of the fluid, which affects the tightness. With the increase of temperature, the viscosity of liquid decreases and the viscosity of gas increases. On the other hand, the change of temperature often causes deformation of the sealing assembly and is easy to cause leakage.

 

⑤ Material of gasket and packing: soft material is easy to produce elastic or plastic deformation under the action of preloading force, thus blocking the channel of fluid leakage, which is conducive to sealing; But soft materials - generally can not withstand the action of high-pressure fluids.

The corrosion resistance, heat resistance, densification and hydrophilicity of the sealing material all have a certain influence on the sealing.

 

⑥ The sealing surface specific pressure: the normal force on the unit contact surface between the sealing surface is called the sealing specific pressure, and the size of the sealing surface specific pressure is an important factor affecting the sealing of the gasket or packing. Usually, a certain specific pressure is generated on the sealing surface by applying a preload force, so that the sealing part is deformed to reduce or eliminate the gap between the sealing contact surface, and prevent the fluid from passing through to achieve the purpose of sealing. It should be pointed out that the action of fluid pressure will cause the specific pressure of the sealing surface to change.

Although the increase of the specific pressure of the sealing surface is beneficial to sealing, it is limited by the extrusion strength of the sealing material. For dynamic sealing, the increase of specific pressure of sealing surface will also cause the corresponding increase of friction resistance.

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