SILO TOP Pressure Relief Valves
Pressure Release Valve are used the discharge the high pressure in the cement silo. Those valves start to run when the pressure value reaches the pre-set pressure limit value.
Those valves are the equipments that keeps the pressure in the cement silo in desired values and prevent the cement silo filter from breaking down.
The cement is transferred from silobus to cement silo with high pressure. In case there is no cement in the silobus, only the air is transferred into the cement silo and thus there occures high pressure in the cement silo. At this moment if Pressure Release Valve do not start to run , the cement silo and the cement silo filter can be damaged seriously.
TECHNICAL SPECS
Description
VCP Pressure Relief Valves consist of a cylindrical casing with a bottom flange to be connected with a spigot welded on the silo roof, a disc shape inner steel lid for negative pressure operation held in position by a central spring rod, an outside steel ring for excess pressure kept in position by three spring rods, gaskets, and a weather protection cover.
Preset springs keep the valve closed when the pressure inside the silo remains within the preset limits. Once the pressure exceeds the preset value the outer ring is pushed up and pressure can escape. In the event of vacuum pressure the spring is compressed and allows the inner disc to drop. The air entering the silo from outside ensures rapid pressure balancing and before the spring pushes the inner disc back up into “closed”position.
Excess Pressure up to 500 mm H2O at a flow rate of 6,000m³/hour (0.05 Bar or 0.72 PSI at 3,531 cfm).
Vacuum/Negative Pressure up to -50 mm H2O at a flow rate of 1,900m³/hour (-0.005 Bar or -0.07 PSI).
Polymer Casing with Mild Steel or Stainless Steel Upstand to connect to your silo.
Casing Diameter 273mm (10 inch).
Available with inductive sensor for an output signal when the valve is activated.
Food Grade Versions Available
VCP Pressure Relief Valves are the last resort when abnormal pressure conditions endanger the silo structure. This is why sudden excess or suction pressure inside the silo must be dealt with instantaneously. Even though ideally a Pressure Relief Valve should never have to go into action, it must be efficient and reliable if needed.
With hundreds of thousands installed worldwide, VCP Pressure Relief Valves have given evidence of being totally reliable under most different conditions.
For applications in the food industry a version compliant with European Regulation (EC) No. 1935/2004 is available.
Description
VCP Pressure Relief Valves consist of a cylindrical casing with a bottom flange to be connected with a spigot welded on the silo roof, a disc shape inner steel lid for negative pressure operation held in position by a central spring rod, an outside steel ring for excess pressure kept in position by three spring rods, gaskets, and a weather protection cover.
Function
Helical springs keep the valve lids closed when the pressure value remains within the preset limits. The three outside spring rods keep the external ring-shaped lid firmly closed as long as the force generated by the pressure inside the silo does not overcome the spring force. Once the pressure exceeds the pre-set value the lid is pushed up and pressure can escape. The smaller lid covers the central circular opening of the external lid from below. It is held in the middle by a single spring rod and is pressed onto the external lid by the normal air pressure inside the silo. In the event of suction pressure the spring is compressed and allows the lid to drop. The air entering the silo from outside ensures rapid pressure balance and pushes the central lid back up into “closed” position.
For applications in the food industry a version compliant with European Regulation (EC) No. 1935/2004 is available.
