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Suck back valves

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From: MrMedic
Added: 24.01.2021
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US7637440B2 - Suck back valve - Google Patents

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DHV-S small suck back dispensing valve Manufacturer China

Oil Problems With Vacuum Pumps. We routinely get inquiries from the field about why oil is found in the intake section of the pump or even in the system being evacuated. Sometimes this accompanies problems with the pump starting. These types of problems are routine for pumps not employing anti-suck back valves. Even when an anti-suck back valve is present, it depends on the effectiveness of these valves, sometimes variable in performance. The HyVac HyperVac series of direct drive pumps employs a new generation anti-suck back valve. We started the pump on a vacuum oven "any system" we reached "X" vacuum pressure and then turned off the pump.
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LVC23, High Purity Suck Back Valve, Single or Unit Type

A suck back valve is proposed which prevents displacement of a diaphragm due to pressure of a supply fluid, together with alleviating concern of changes in the amount of supply fluid which is to be sucked, and enabling ease of installation by making compact the system which employs the suck back valve. A diaphragm is displaced in the direction of arrow A under an activation operation of a linear voice coil type luffing device. Compressed air is introduced into a chamber, wherein the diaphragm is supported under an applied pressure.
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High purity chemical valves, series LVC with integral fittings eliminate the possibility of residual liquid in pipe threads. In addition, the body has been designed for smooth flow with minimal internal dead space. Special diaphragm construction insures gentle opening and closing preventing the formation of micro-bubbles. A unique guide ring on the piston rod eliminates lateral motion of the poppet, increasing seal life and reducing particle formation.
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