Nodular Cast Iron Swing Check Valve DN300 Flanged Marine Check Valve

• Customization: Available
• Connection Standard: GB/T17241.6
• Nominal Pressure: 1.0\1.6\2.5MPa
• Model NO.: ANGGUANG-CV
• Sealing Test Pressure: 1.1\1.8\2.8MPa
• Connection Type: Clamp/Flange Connection
• Shell Test Pressure: 1.5\2.4\3.8MPa
• Groove Standard: GB 5135.11
• Implementation Standard: GB/T 13927-2008
• Transport Package: Paper Box /Wooden Box
• Specification: customized
• Trademark: ANGGUANG
• Origin: China Quanzhou
• Production Capacity: 50000 Tons / Years

Product Description

Detailed Photos

Product Description

Fire check valve

The following is the introduction to the fire check valve:
 
Working Principle
 
It realizes unidirectional conduction by using the fluid pressure difference and its own structure. When the water flow in the fire protection pipeline flows forward and the pressure reaches a certain value, the pressure generated by the water flow pushes the valve disc to open, allowing the water to pass through smoothly. When the water flow reverses or the forward pressure decreases and the reverse pressure is greater than the forward pressure, the valve disc closes quickly under the action of the reverse pressure and its own gravity to prevent the water flow from flowing backward, thus preventing the backflow of fire protection water from causing system failures or affecting the fire extinguishing effect.
 
Structural Features
 
- Swing type structure: The valve disc rotates around the shaft to open and close. The water flow channel is smooth with low resistance. It is suitable for large-diameter pipelines and can be installed on horizontal or vertical pipelines. However, when installed vertically, the water flow direction should be from top to bottom.
- Lift type structure: The valve disc moves up and down along the axis of the valve stem with good sealing performance. It is suitable for small - diameter pipelines and is generally installed on horizontal pipelines. The water flow direction should be consistent with the arrow direction in the valve body.
- Spring type structure: It uses the spring force to assist the action of the valve disc with a fast response speed. It can close quickly when the pressure changes and can be installed on pipelines in various positions with low requirements for installation space. It is often used in fire protection systems with special requirements.
 
Classification
 
According to the structural form, it can be divided into swing type, lift type and spring type fire check valves. According to the material, it can be divided into cast iron, cast steel, stainless steel fire check valves, etc. Cast iron materials have low cost but poor corrosion resistance, while stainless steel materials have good corrosion resistance and are suitable for environments with poor water quality or special requirements.
 
Advantages and Disadvantages
 
- Advantages: It can effectively prevent the backflow of fire protection water and ensure the normal operation and safety of the fire protection system. It has a simple structure, is easy to operate and does not require additional power drive. It is reliable in operation, stable in performance and has a long service life.
- Disadvantages: There is a certain pressure loss, which affects the water flow transmission efficiency. It has requirements for the installation position and water flow direction, and improper installation will affect the performance. The valve discs of some types of fire check valves are easily affected by impurities, resulting in poor sealing or jamming.
 
Installation and Maintenance
 
- Installation: It should be installed on horizontal pipelines or vertical pipelines that meet the regulations. Ensure that the installation position is convenient for maintenance and repair. The inlet and outlet directions should be consistent with the water flow direction, and a certain distance should be maintained from other valves and pipe fittings to avoid mutual interference.
- Maintenance: Regularly check the wear and sealing conditions of the valve disc, valve seat and other components, and clean the internal impurities in time to prevent blockage. For the spring type fire check valve, check the spring elasticity and replace it in time if there is a problem.

Certifications

Company informations

work shop

Sample Room

FAQ

1. Are you a factory or trading company?
We are one of the largest fire hose manufacturer in Asia, we been specilize in fire hose and fire-fighting equipment for more than
30 years. We warmly welcome clients from worldwide to visit our factory and cooperate with us. We can offer OEM & ODM service.

2. Can you produce goods with special specification ?
Our company focuses on customized products.

3. How long is the delivery time?
30-45 days after the advance payment.
 

4. What's your advantage?
Independent R&D team, professional production and sales team, great production capacity sustainable supply. Use the best material
and production process. Low defective rate.

5. How can we guarantee quality?
Always a pre-production sample before mass production; Always final Inspection before shipment.