Product

Welding check valve

Brand：Pneumatic eccentric butterfly valve 型号：H61H-64C

焊接止回阀是通过焊接方式连接管道的自动阀门，主要用于防止介质倒流，其核心技术与应用如下：

1、 Core Structure and Principles
Automatic opening and closing mechanism
The valve disc is opened by unidirectional pressure of the fluid, and when flowing in reverse, it closes by relying on the pressure of the medium and its own weight, blocking the backflow of the medium.
Welding connection form
Socket welding (SW): suitable for DN10-50 small-diameter pipelines, with high sealing but difficult disassembly;
Butt welding (BW): used for DN15-2000mm pipelines, with high pressure resistance and strong fatigue resistance.
Main material
The valve body is made of forged steel (A105), stainless steel (SS304/316), chromium molybdenum steel (WC6/WC9), etc., and can withstand high temperatures ranging from -196 ℃ to 550 ℃ and high pressures of 32Mpa.
2、 Type and Applicable Scenarios
Type, structural characteristics, advantages, applicable working conditions
The rotary hinge valve disc has low flow resistance for opening and closing, making it suitable for large-diameter pipeline petrochemical and power station systems
The vertical movement of the lifting valve disc has good sealing performance and is resistant to high-pressure steam pipelines and high-pressure oil circuits
The Y-shaped DC valve body is inclined at a 45 ° angle to reduce flow resistance and minimize water hammer effects, making maintenance convenient for transporting high-temperature steam and natural gas
3、 Key technical parameters
Pressure rating: Class 150LB-3500LB (American standard), PN1.6-32.0Mpa;
Sealing form:
Hard seal (metal to metal): resistant to high temperatures of 550 ℃;
Soft seal (inlaid with rubber): Low temperature clean medium;
Installation requirements:
The lifting type requires vertical installation, while the swing type can be installed horizontally/vertically;
The flow direction of the medium must be consistent with the arrow mark on the valve body.
4、 Selection precautions
Disable scenario:
Containing solid particles or high viscosity media (causing valve disc blockage);
Negative pressure conditions in pipelines (which may damage the sealing structure).
Special needs response:
Chromium molybdenum vanadium steel (such as F91) is selected for high temperature environments (>400 ℃);
The corrosive medium uses Hastelloy (HC-276) valve disc.
5、 Typical Model Example
Model type, pressure rating, applicable medium characteristics
H61Y-800LB lifting type 800LB steam and oil bolt valve cover, online maintenance
H64Y-3500LB swing type 3500LB high-temperature steam pressure self sealing, resistant to water hammer
H67Y (Y-shaped DC) DC Class 1500LB natural gas and liquefied gas full bore design, with minimal pressure drop