Gray Cast Iron Flat Gate Valve

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Technical Specification
Product name	Gray cast iron 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
Carbon steel	Gray cast iron flat
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 Gray cast iron flat gate valve meet your needs and do better.
• Check raw materials before production at Gray cast iron flat gate valve.
• Spot checks are carried out during the processing of Gray cast iron flat gate valve.
• 100% inspection of Gray cast iron flat gate valve before shipment.
• Provide a one-year service for the products provided by Gray cast iron 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: Classification of flat gate valves

A: Plate gate valve can be divided into guided plate gate valve, no deflector plate gate valve, high pressure water injection plate gate valve, gas plate gate valve, flange plate gate valve, welded plate gate valve, clamp plate gate valve, single plate plate gate valve and double plate plate gate valve.

Now the use of plate gate valve is more and more widespread, many pipelines are using plate gate valve to replace the ordinary wedge gate valve.

 

Q: What is the difference between gray cast iron and carbon steel?

A: 1. The chemical composition is different

Gray cast iron contains 2%-4% carbon and 1%-3% silicon, while also containing other alloying elements, such as manganese, phosphorus, sulfur and so on. In contrast, the carbon content in carbon steel is generally not more than 2%, while there is a certain amount of manganese, silicon, phosphorus and sulfur and other elements.

 

2. Different physical properties

Gray cast iron has low hardness and good machinability, but it is brittle and prone to crack. The hardness of carbon steel is high, the toughness is good, and it is not easy to produce deformation and cracks after being stressed.

 

3. Different uses

Due to the brittleness of gray cast iron, it is often used in some parts that do not need to withstand force, such as knife handles, door lock fittings and water pipes. Carbon steel is widely used in the manufacture of tools, bearings and mechanical parts, because carbon steel can withstand greater forces, while also having good wear resistance.

 

To sum up, although gray cast iron and carbon steel are metal materials, their chemical composition and physical properties are different, so the use is different. When selecting materials, it is necessary to choose according to the specific conditions of use.

 

Q: Can gray cast iron be welded?

A: The weldability of gray cast iron is poor, especially in arc welding, if the electrode is improperly selected, or some special measures are not taken, a series of defects will occur in the welding process, and the most serious of these defects are white cracks and cracks.

 

Q: What items should be calculated in the design of flat gate valves?

A: When designing flat gate valves, the following items should generally be calculated:

1. The total force and calculated specific pressure on the sealing surface;

2. Strength of the valve stem (upper and lower);

3. Explain the strength of the board;

4. The total force and calculated specific pressure on the sealing surface of the packing box;

5. Stuffing box (stuffing box) and body box thickness;

6. The strength of the middle flange connection bolt (at room temperature, initial heating, high temperature strength > ;

7. Middle flange strength;

8. Valve body wall thickness;

9. Strength of support;

10. Gate thickness;

11. Total torque and circumferential force of handwheel.

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