Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

HC44X Swing Flex Check Valve
H76X Wafer Dual Disc Check Valve
HH49X Micro Resistance Slow Closing Butterfly Check Valve
H44W Swing Check Valve
H44W API Swing Check Valve
PXH44H Slanting Disc Check Valve
H74H Single Plate Wafer Check Valve(Long Type)
H76W Dual Plate Check Valves
H44H Forged Steel Flange Check Valve
HH44X Heavy Hammer Micro Resistance Slow-Closing Check Valve
HH47X Buffered Butterfly Check Valve
H74H Wafer Swing Check Valve
H14W Internal Thread Swing Check Valve
H44F46 Fluorine-Lined Swing Check Valve
H44T Cast Iron Swing Check Valve
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Phone：+86（577）6730 7899
Mobile：+86 189 6779 6135
Fax：+86（577）6738 7099
Email：Yannie@kaiweixi.com
Address：No. 1, Linxia Road, Sanqiao Industrial Zone, Oubei Street, Yongjia County, Zhejiang Province，china
Website：https://www.kaiweixi.com

Swing check valve

Swing check valve is a type of valve that relies on the pressure of the fluid itself, the weight, and the spring acting alone or simultaneously to achieve automatic opening and closing. It is mainly used to prevent medium backflow in pipelines and belongs to the category of automatic valves. Its core structure includes a valve body, a valve cover, a valve disc (usually disc-shaped), and a rocker arm. The valve disc is hinged inside the valve body through a joystick. When the medium flows in the forward direction, the fluid pressure pushes the valve disc to rotate around the axis and open; When the flow stops or reverses, the valve disc automatically closes under its own weight, medium reverse pressure, or auxiliary spring action, forming a seal. Kaiweixi Valve mainly produces API American standard swing check valves, micro resistance slow closing check valves, rubber disc check valves, butterfly check valves, clamp check valves, fluorine lined swing check valves, disc swing check valves and other swing check valves, which have the characteristics of low flow resistance, short opening and closing stroke, and are suitable for larger diameters and higher flow rate conditions. Widely used in pipeline systems that do not allow medium backflow, such as pump outlets and boiler feedwater, in industries such as water supply and drainage, petroleum, chemical, and power.

HC44X Swing Flex Check Valve

Model：
HC44X-10Q/HC44X-16Q/HC44X-25Q/HC44X-10P/HC44X-16P/HC44X-25P
Specification：
DN50-DN600
Pressure：
PN10,PN16,PN25
Material：
Ductile iron,cast iron,stainless steel

HC44X Swing Flex Check Valve OverviewThe HC44X swing flex check valve can be used in water supply pipelines for clean water, raw water, and sewage to prevent backflow, effectively limit destructive water hammer, and ensure pipeline safety. It features a novel structure, low fluid resistance, reliable sealing, smooth opening and closing, long service life, and its oil pressure and slow closing are unaffected by the medium, resulting in good energy-saving performance. HC44X Swing Flex Check Valve Product Image

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H76X Wafer Dual Disc Check Valve

Model：
H76X-10Q/H76X-16Q/H76X-25Q
Specification：
DN40-DN1000
Pressure：
PN10,PN16,PN25
Material：
Cast Iron, Ductile Cast Iron or Nodular Cast Iron, Cast Steel, Stainless Steel

H76X Wafer Dual Disc Check Valve OverviewThe H76 type wafer check valve features a simple structure, light weight, large flow rate, and a spring-loaded closing mechanism for rapid valve closure, preventing water hammer pressure. It is suitable for industrial applications, high-rise buildings, water supply and drainage pipelines, and at pump outlets to prevent motor reversal during pump shutdown.H76X Wafer Dual Disc Check Valve Product Image

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HH49X Micro Resistance Slow Closing Butterfly Check Valve

Model：
HH49X-10Q/HH49X-16Q/HH49X-25Q/HH49X-10C/HH49X-16C/HH49X-25C/HH49X-10P/HH49X-16P/HH49X-25P
Specification：
DN50-DN1000
Pressure：
PN10,PN16,PN25
Material：
Ductile iron,cast iron,carbon steel, stainless steel

HH49X Micro Resistance Slow Closing Butterfly Check Valve OverviewThe HH49X Micro Resistance Slow Closing Butterfly Check Valve can be used in water supply pipelines for clean water, sewage, seawater, and other media. They prevent backflow and effectively limit destructive water hammer, ensuring pipeline safety. They feature a novel structure, small size, light weight, low fluid resistance, reliable sealing, smooth opening and closing, wear resistance, long service life, and oil pressure and slow closing unaffected by the media, resulting in good energy-saving performance.HH49X Micro Resistance Slow Closing Butterfly Check Valve product image

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H44W Swing Check Valve

Model：
H44W-16P/H44W-16C/H44W-25P/H44W-25C/H44W-40P/H44W-40C
Specification：
DN15-800
Pressure：
PN16,PN25,PN40,PN64
Material：
Carbon Steel, Stainless Steel

H44W Swing Check Valve OverviewThe H44W Swing Check Valve is a versatile automatic valve featuring flanged connections and utilizing a swinging disc mechanism to achieve unidirectional flow control. The valve body is typically constructed from materials such as cast steel, stainless steel, or cast iron. Its internal disc rotates around a fixed pivot, swinging open under forward medium flow and rapidly closing under its own weight and reverse pressure during backflow.With a simple and reliable design, this valve imposes minimal flow resistance. It is suitable for pipeline systems handling water, steam, oil products, and mildly corrosive media. The valve can be installed horizontally or on vertical pipelines with upward flow. Widely used in building water supply and drainage systems, HVAC applications, industrial circulating water systems, and pump discharge lines, it serves as a fundamental device for preventing medium backflow.H44W Swing Check Valve Product Image

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H44W API Swing Check Valve

Model：
H44W-Class150P/H44W-Class300P/H44W-Class600P/H44W-Class900P/H44W-1500P/H44W-Class150C/H44W-Class300C/H44W-Class600C/H44W-Class900C/H44W-1500C
Specification：
1/2"-48"
Pressure：
Class150LB,Class300LB,Class600LB,Class900LB,Class1500LB
Material：
Carbon Steel,Stainless Steel

H44W API Check Valve Overview The H44W API Swing Check Valve is a flanged check valve designed and manufactured in accordance with American standards (ASME/API), featuring a swing-type structure. The valve body is typically made of materials such as A216 WCB cast steel or CF8 stainless steel, with pressure ratings ranging from Class 150 to Class 600. The valve operates by using the forward flow of the medium to push the disc open as it rotates around its pivot. When the medium stops or reverses flow, the disc automatically closes under its own weight and reverse pressure, achieving reliable unidirectional flow control. Strictly compliant with standards such as API 6D, this valve is specifically designed for high-pressure, high-temperature, and demanding pipeline systems in industries such as petroleum, natural gas, chemical processing, and power plants. It effectively prevents backflow of water, steam, oil products, and corrosive media, making it a critical component for ensuring the safe operation of industrial facilities.H44W API Check Valve Product Image

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PXH44H Slanting Disc Check Valve

Model：
PXH44H-CL150/PXH44H-CL300
Specification：
2"-36"
Pressure：
125/150LB，250/300LB
Material：
CI,DI,Carbon Steel, Stainless Steel,Duplex SS Monel

Overview The tilting disc check valve is an energy-saving check valve featuring a tilted disc design that automatically opens and closes by means of medium flow. It typically adopts a flanged connection. The valve body is mainly made of cast steel, stainless steel or ductile iron, with its internal disc performing an inclined rotary motion around an eccentric shaft. This valve can be installed either horizontally or vertically. When the medium flows in the forward direction, it pushes the disc to open smoothly, providing an almost straight-through flow path with minimal pressure loss. When the medium stops or flows backward, the disc quickly returns to its closed position under its own weight and the reverse medium pressure, effectively reducing water hammer impact. It is specifically designed for piping systems sensitive to water hammer and requiring low flow resistance. Widely used in pump outlets, water supply networks, wastewater treatment, industrial circulating water and similar projects, it serves as an important protective device that enhances system energy efficiency and operational stability.PXH44H Slanting Disc Check Valve Product Image

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H74H Single Plate Wafer Check Valve(Long Type)

Model：
H74H-20C/H74H-40C/H74H-64C/H74H-100P/H74H-150P
Specification：
DN50-DN600
Pressure：
PN20-PN150
Material：
WCB、Stainless Steel

OverviewThe H74H Single Plate Wafer Check Valve(Long Type) is an energy-saving check valve featuring a single-disc design that automatically opens and closes by means of medium flow. It typically adopts a wafer-type connection. The valve body is mainly made of stainless steel, cast steel or ductile iron, with its internal single disc performing rotary motion around a shaft pin. This valve can be installed either horizontally or vertically. When the medium flows in the forward direction, it pushes the disc to open smoothly, providing an unobstructed flow path with minimal pressure loss. When the medium stops or flows backward, the disc quickly returns to its closed position under spring force and reverse medium pressure, offering reliable sealing and fast closing speed. It is specifically designed for piping systems with limited installation space and requiring quick closure. Widely used in water supply and drainage, fire protection systems, HVAC, and industrial circulating water projects, it is a simple, economical and practical pipeline protection device.H74H Single Plate Wafer Check Valve(Long Type) Product Image

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H76W Dual Plate Check Valves

Model：
H76W-10C/H76W-25C/H76W-40C/H76W-64P/H76W-100P/H76W-160P
Specification：
DN50-DN1200
Pressure：
PN10-PN160
Material：
WCB、Stainless Steel

OverviewThe H76W dual-plate check valve is an energy-efficient check valve that features a twin-disc design and operates automatically based on medium flow. It typically uses a wafer-type connection. The valve body is commonly made of stainless steel, cast steel, or ductile iron, with its two discs performing a symmetrical rotary motion around the same shaft. The valve can be installed either horizontally or vertically. When the medium flows in the forward direction, it pushes the dual discs to open smoothly, and the flow path is nearly straight-through, resulting in low pressure loss. When the medium stops or flows in reverse, the dual discs close rapidly under the combined effect of spring force and reverse medium pressure, ensuring reliable sealing and fast shut-off. This valve is specifically designed for pipeline systems with limited installation space and the need for quick closure. It is widely used in water supply and drainage, fire protection systems, HVAC, and industrial circulating water projects, serving as a compact, economical, and practical pipeline protection device.H76W Dual Plate Check Valves Product Image

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H44H Forged Steel Flange Check Valve

Model：
H44H-16C/H44H-25P/H44H-40P/H44H-40R
Specification：
DN15-DN50
Pressure：
PN16,PN25,PN40
Material：
forged steel,forged stainless steel

H44H Forged Steel Flange Check Valve Overview The H44H Forged Steel Flange Check Valve is an automatic valve designed with a forged steel body and flanged connections, utilizing a swing disc mechanism to achieve unidirectional flow control. The valve body is typically forged from materials such as A105, offering excellent mechanical properties and material density. It features a metal hard-seal structure, with the sealing surfaces of the disc and seat often overlay-welded with hard alloys.The valve operates by swinging open under the pressure of forward-flowing medium and rapidly returning to the seat under its own weight and reverse pressure when the medium stops or reverses, ensuring tight closure.Designed specifically for high-temperature, high-pressure, and high-flow-rate applications, this valve is widely used in critical pipelines in industries such as petrochemicals, power plants, natural gas transmission, and high-temperature steam systems. It serves as a highly reliable safety device to prevent medium backflow and protect core equipment.H44H Forged Steel Flange Check Valve Product Image

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HH44X Heavy Hammer Micro Resistance Slow-Closing Check Valve

Model：
HH44X-10/HH44X-16/HH44X-10Q/HH44X-16Q
Specification：
DN40-DN900
Pressure：
PN10,PN16
Material：
Ductile iron,cast iron

HH44X Heavy Hammer Micro Resistance Slow-Closing Check Valve OverviewThe HH44X Heavy Hammer low-resistance slow-closing check valve is a flange-connected national standard check valve. Adopting a counterweight-driven slow-closing structure and low-resistance flow channel, it automatically prevents media backflow, effectively mitigates water hammer via slow closing, and reduces pressure loss for energy savings. Featuring compact design, easy installation and maintenance, reliable sealing and long service life, it is widely used in water supply/drainage, industrial pipe networks and other systems, suitable for clean water and mildly corrosive media.HH44X Heavy Hammer Micro Resistance Slow-Closing Check Valve Product Image

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HH47X Buffered Butterfly Check Valve

Model：
HH47X-10/HH47X-16/HH47X-25/HH47X-10Q/HH47X-16Q/HH47X-25Q/HH47X-10P/HH47X-16P/HH47X-25P
Specification：
DN200-DN1400
Pressure：
PN10,PN16,PN25
Material：
cast iron,ductile iron,stainless steel,cast steel

HH47X Buffered Butterfly Check Valve OverviewThe HH47X buffer butterfly check valve is a key component in industrial fluid transport systems to prevent backflow of media. Its core is to achieve smooth opening and closing of the valve disc through a built-in hydraulic or elastic buffer mechanism, which can reduce the closing impact speed by 30%-50%, suppressing water hammer, reducing noise and sealing loss at the source. The sealing material is matched according to the characteristics of the media. When fully open, the flow resistance coefficient is as low as 0.5-1.2, resulting in significant energy savings.This valve is widely used in water supply and drainage, heating, chemical and industrial circulating water systems, and is especially suitable for scenarios where backflow prevention is required, such as the outlet end of a water pump. The selection should be determined based on the medium parameters, operating pressure and flow rate, and installation environment. The seal and lubrication should be checked regularly. Before maintenance, the medium must be cut off and the pressure released to ensure safety.HH47X Buffer Butterfly Check Valve Product Image

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H74H Wafer Swing Check Valve

Model：
H74H-10C/H74H-16C/H74H-25C/4H74H-0C/H74H-16P/H74H-25P/H74H-40P
Specification：
DN50-DN600
Pressure：
PN10,PN16,PN25,PN40
Material：
Carbon Steel, Stainless Steel

H74H Wafer Swing Check Valve OverviewThe H74H Wafer Swing Check Valve is a high-performance check valve featuring a wafer-type connection and a metal hard-seal design for both the body and disc. The valve body is clamped between two pipeline flanges using long bolts, while the internal disc operates by swinging around a fixed pivot to open and close.Constructed from high-temperature-resistant alloy materials with specially hardened sealing surfaces, the valve maintains reliable sealing performance even under demanding conditions such as high temperatures, high pressures, and media containing particles.The valve opens under forward medium flow and closes rapidly under the disc’s own weight and reverse pressure during backflow. Designed specifically for industrial systems such as petrochemical plants, power stations, and high-temperature steam applications, it is an ideal choice for pipelines with strict installation space limitations and high requirements for check valve performance.H74H Wafer Swing Check Valve Product Image

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H14W Internal Thread Swing Check Valve

Model：
H14W-16P
Specification：
DN15-50
Pressure：
PN16
Material：
Stainless steel

H14W Internal Thread Swing Check Valve Overview The H14W Internal Thread Swing Check Valve is an automatic valve that utilizes internal thread connections and operates through a swinging motion of the disc around a fixed pin within the valve body to achieve one-way flow control. Major components, including the valve body and disc, are typically made of brass or stainless steel, ensuring a simple and durable structure.Its working principle involves the disc swinging open under the pressure of forward-flowing media. When forward pressure is lost or backflow occurs, the disc swiftly returns to the valve seat under its own weight and the force of the reverse flow, achieving automatic closure.Suitable for installation in both horizontal and vertical pipelines, this valve has minimal impact on flow resistance. It is widely used in building water supply and drainage systems, HVAC installations, general industrial equipment, and pump discharge pipelines. It effectively prevents backflow of media such as water, oil, and air, safeguarding upstream equipment.H14W Internal Thread Swing Check Valve Product Image

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H44F46 Fluorine-Lined Swing Check Valve

Model：
H44F46-16C/ H44F46-10C/ H44F46-10/ H44F46-16
Specification：
DN15-DN500
Pressure：
PN10,PN16
Material：
Cast iron, cast steel, stainless steel lined with FEP/PTFE

H44F46 Fluorine-Lined Swing Check Valve Overview The H44F46 Fluorine-Lined Swing Check Valve is an automatic check valve specifically designed for highly corrosive media. It features a flanged connection and a swing-type structure. The valve body and the internal flow passage surfaces are fully lined with fluoroplastic materials such as perfluoroalkoxy (FEP/PTFE), while the disc is typically constructed as a fully fluoroplastic-lined or fluoroplastic-coated metal core. The valve operates by swinging open under the pressure of forward-flowing medium and automatically closing under its own weight and reverse flow when the medium stops or reverses direction. This design leverages the exceptional chemical inertness of fluoroplastics, enabling resistance to most strong acids, alkalis, organic solvents, and mixed corrosive media. It is widely used in pipelines handling highly corrosive media across industries such as chemical processing, pharmaceuticals, pesticides, electroplating, and environmental protection. The valve serves as a critical safety device to prevent the backflow of harmful media and protect key equipment.H44F46 Fluorine-Lined Swing Check Valve Product Image

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H44T Cast Iron Swing Check Valve

Model：
H44T-10/H44T-16
Specification：
DN40-400
Pressure：
PN10,PN16
Material：
Grey iron

H44T Cast Iron Swing Check Valve Overview The H44T Cast Iron Swing Check Valve is a standard-type check valve with a gray iron or ductile iron body and flanged connections, featuring an internal swing-type structure. The valve operates by using the pressure of forward-flowing medium to push the disc open as it rotates around its pivot. When the medium stops or reverses flow, the disc automatically swings back to the seat under its own weight and reverse pressure, thereby preventing medium backflow.Designed with a robust and durable structure, this valve is specifically intended for general media such as water, steam, and oil products. It typically operates at pressures of PN10/16/25 and is widely used in building water supply and drainage systems, HVAC applications, general industrial circulating water systems, pump discharge lines, and similar scenarios. It serves as a fundamental and economical automatic control device for preventing medium backflow.H44T Cast Iron Swing Check Valve Product Image

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

HC44X Swing Flex Check Valve

H76X Wafer Dual Disc Check Valve

HH49X Micro Resistance Slow Closing Butterfly Check Valve

H44W Swing Check Valve

H44W API Swing Check Valve

PXH44H Slanting Disc Check Valve

H74H Single Plate Wafer Check Valve(Long Type)

H76W Dual Plate Check Valves

H44H Forged Steel Flange Check Valve

HH44X Heavy Hammer Micro Resistance Slow-Closing Check Valve

HH47X Buffered Butterfly Check Valve

H74H Wafer Swing Check Valve

H14W Internal Thread Swing Check Valve

H44F46 Fluorine-Lined Swing Check Valve

H44T Cast Iron Swing Check Valve

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