Pragmaticus Blog

Pragmaticus, huge valves provider based in German, delivered gate valves for the test stand of one of the leading pump manufacturers in Europe.
A gate valve which Pragmaticus supply is based on Pengineering capabilities and previous industrial experience and deep manufacturing knowledge. These reasons allow Pragmaticus gate valves being used on leading pump manufacturer’s test stand.
To understand why gate valves are necessary on test stand for pumps’ checking some words about gate valves’ and pumps’ work principle.
A gate valve (so-named for working process: the part that either stops or allows flow through the valve acts as like as a gate does) opens by lifting a round or rectangular gate out of the path of the fluid. When the valve is wide open the gate is fully drawn up into the valve bonnet (reminding metro gates) and allows a stream to flow further. But there is a little pressure drop or flow restriction during passing through the valve because gate aperture for flow through has the valve the same size as the pipe in which the valve was installed.
The gate valves are mostly used for liquid streams. And in the same time the pumps are used to move fluids (liquids, slurries, or gases). A pump displaces a volume by physical or mechanical action. That is why test stands for pump checking are equipped by gate valves. Pumps displace fluid, causing a flow. According to the methods for moving a fluid, pumps fall into five major groups: direct lift, displacement, velocity, buoyancy and gravity pumps. Gate valves, established on test stand, help to check displacing process by opening and shutting a gate.
For pump manufacturer test stand allows trying operation in different condition, regimes, with open and shut gate valve. And Pragmaticus valves meet all the requirements of pumps’ industrial tests. (more…)