in another video we looked at a simpler example with only one remote relief valve being used on the vent port in this particular case our vent port remote control is hooked up to three parallel branches in another video we looked at a simpler example with only one remote relief valve being used on the vent port in this particular case our vent port remote control is hooked up to three parallel branches
each with a normally closed solenoid valve following on to another small direct acting relief valve being used as a pilot section to control the main pop it in the main relief valve each with a normally closed solenoid valve following on to another small direct acting relief valve being used as a pilot section to control the main pop it in the main relief valve
remember that the amount of flow leaving port ex is a small amount of flow it is only what is necessary to control the pressure above the main pop it to allow an unbalancing condition so that pressure from underneath can event to tank so that the pumps flow can return to tank remember that the amount of flow leaving port ex is a small amount of flow it is only what is necessary to control the pressure above the main pop it to allow an unbalancing condition so that pressure from underneath can event to tank so that the pumps flow can return to tank
leaving port x if we turn on the sole annoyed for the top branch what we find out is that pilot flow now occurs through that top branch it ceases to flow leaving port x if we turn on the sole annoyed for the top branch what we find out is that pilot flow now occurs through that top branch it ceases to flow
through the main pilot because that pilot is set to five thousand pilot oil has found a path of least resistance that is oil leaving the relief valve finding an easier path through the main pilot because that pilot is set to five thousand pilot oil has found a path of least resistance that is oil leaving the relief valve finding an easier path
and in so doing on balancing the pressure above the main pop it to make it easier for flow to return to tank and that is what is now controlling our system pressure at one thousand p s I and in so doing on balancing the pressure above the main pop it to make it easier for flow to return to tank and that is what is now controlling our system pressure at one thousand p s I
this is a very typical scenario that could be used in a manufacturing plant for sale a press machine where different pressures are needed at different steps in the machines cycle this is a very typical scenario that could be used in a manufacturing plant for sale a press machine where different pressures are needed at different steps in the machines cycle
turning on soul annoyed be in the middle we see that our sister pressure gauge is now set to two thousand p s I turning on soul annoyed see will find out our system pressure is now at three thousand p s I turning on soul annoyed be in the middle we see that our sister pressure gauge is now set to two thousand p s I turning on soul annoyed see will find out our system pressure is now at three thousand p s I
and so these electrical solenoid would typically be controlled by some type of programmable logic controller and the steps would be handled with automation and so these electrical solenoid would typically be controlled by some type of programmable logic controller and the steps would be handled with automation
makes it very easy way to have different pressures available at different steps in the machine cycle main pressure will never exceed five thousand p s I this setting on the main pilot section makes it very easy way to have different pressures available at different steps in the machine cycle main pressure will never exceed five thousand p s I this setting on the main pilot section