Slow-closing Butterfly Check Valve, DI, QT450, DN100, PN16

Product Name: Micro-Resistance Slow-closing Butterfly Check Valve
Body Material: Ductile Iron QT450
Size: DN100, 4 Inch
Pressure: PN16, Class 150 LB
End Connection: Flanged

Product Range

Product Models: HH48X/H, HH49X/H, HH46X/H
Nominal Diameter: DN40-DN800, 1-1/2 Inch to 32 Inch
Pressure Range: 1.0-2.5 MPa, PN10, PN16, PN25, Class 150-300 LB
Body Material: Cast Iron, Ductile Iron, Cast Steel, Stainless Steel

Technical Specifications for Micro-Resistance Slow-Closing Butterfly Check Valve

Material Specifications for Micro-Resistance Slow-Closing Butterfly Check Valve

Dimensions for Micro-Resistance Slow-Closing Butterfly Check Valve

Principle of Operation for Micro-Resistance Slow-Closing Butterfly Check Valve

The opening and closing of the check valve rely on the flow and force of the medium to automatically open or close, preventing the backflow of the medium. Check valves generally come in four types: lift, swing, butterfly, and horizontal. The vertical lift check valve should be installed horizontally, while the vertical swing check valve and bottom valve are usually installed vertically. The swing check valve's installation position is not limited and can be installed horizontally, but it can also be installed vertically or on an inclined pipeline.

Note: The check valve only allows the medium to flow in one direction and special attention should be paid to the direction of flow. The direction of the medium's normal flow should be consistent with the direction indicated by the arrow on the valve body; otherwise, it will interrupt the normal flow of the medium.

The principle of the micro-resistance slow-closing butterfly check valve is to rely on the force of the medium entering the valve to push the two valve flaps to open. At the same time, the pressure of the medium enters the lower part of the piston chamber through the oilway, pushing the piston upward. The oil in the upper part of the piston is expelled through the needle valve into the two small air chambers at the ends of the valve body, causing the piston in the small air chamber to extend. When the pressure of the medium entering the valve drops below the outlet pressure, the medium will flow back. At this time, under the action of the spring and the force of the medium flowing back, the valve flaps will automatically close. However, due to the piston rod being in an extended position, the valve flaps cannot fully close, leaving about 20% of the area for the medium to pass through, thus eliminating the effect of water hammer. The valve flaps are divided into two parts by the piston to first quickly close and then slowly close in two steps, which not only prevents motor reversal but also serves to eliminate noise.

Performance Characteristics of Micro-Resistance Slow-Closing Butterfly Check Valve

1. Small size, light weight, and structural length is only about one-third of the swing check valve.

2. Excellent slow-closing system performance, not affected by the impact of the medium in the pipeline. The valve flaps close first and then slowly, which can prevent destructive water hammer.

3. Rubber soft sealing, good sealing performance, wear-resistant, and long service life.

4. Rubber cushioning, stable opening and closing, no vibration, no noise.

5. Compared to the old check valve, it has a smaller flow resistance and significant energy-saving effects.