Products Details

Differential Pressure Bypass Valve, also known as Differential Pressure Bypass Valve (DPBV), is a device used for pressure regulation control in piping systems. It has the advantages of compact structure, simple operation, high reliability and good control precision. The technical parameters of this valve include pressure range, temperature range, flow range, control mode, power supply voltage and valve body material.
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The pressure range of the electric differential bypass valve is usually between 0.1 and 16MPa, the temperature range is between -20 ° C and +250 ° C, and the flow range is generally 0.2 to 20 cubic meters per hour. The control mode can be manual, automatic or servo, in which the servo control mode has the highest control accuracy. The supply voltage is usually 220VAC or 380VAC, and the body material may be corrosion resistant materials such as carbon steel, stainless steel or copper alloy.
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The main function of the differential pressure bypass valve is to improve the utilization rate of the system, maintain a constant differential pressure value, and minimize the system noise and damage caused by excessive differential pressure. Its applications include construction and water treatment. Valve features include ease of operation, wide application range, frictionless switching and reliable sealing performance, as well as top-loading structure.
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In water-heating systems, differential bypass valves prevent possible undesirable interactions with the system circulating pump due to valve zoning control. Ideally, regardless of which regional circuits are in operation, the difference in supply and return water pressure for a given regional circuit should remain constant. The circulating pump simply provides more or less flow depending on whether an additional area circuit is turned on or off. In order to achieve this, the pump curve of the circulating pump must be flat.
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The differential bypass valve intervenes between the valve and the circulating pump to ensure that the system delivers the expected quiet and reliable performance. When the zone circuit is closed, the system curve becomes steeper, the operating point slides up and to the left along the pump curve, and the remaining zone circuit feels the increased pressure difference. This increased pressure difference can lead to some undesirable consequences, such as increased flow can lead to "flow noise", and high flow rates can also lead to erosion of valve seats and other pipe components.
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Differential bypass valve setup consists of adjusting the pressure of the plug in the valve against the seat, and when the differential pressure exceeds a set threshold, the plug begins to lift from the seat. Valves are designed to maintain a relatively constant differential pressure as flow increases above threshold Settings, although like any pipe assembly, friction losses increase with flow.
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In practical applications, most residential and small commercial systems can use 3/4 inch or 1 inch size differential bypass valves. Larger systems may require 1.25-inch valves. A correctly selected and set differential bypass valve plays an important role in helping a zoned plumbing system deliver the quiet performance that owners expect.