0 0
Hi!
3040-Series
How The 3040-Series Works The 3040 Series Back Pressure Valves relieve upstream pres sure in a variety of processes. Automatically maintains desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for intermittent protection against over-pressure conditions
Controlling Pressure
The 3040 Series Back Pressure Valve senses upstream pressure acting on the under side of the diaphragm through a port in the bottom diaphragm case. An increase in the up stream pressure above the set point will compress the spring and allow the valve to open. The spring will close the valve as the upstream pres sure decreases to the set-point. The higher the system pressurizes above the relief set-point pressure, the more flow the valve will pass. It is therefore typical to specify the maximum capacity of a back pressure relief valve at 10% & 20% over set-pressure.
Fast in Response The 3040 contains a diaphragm that amplify the force on the spring, allowing the valve to open faster than the R series valve. This allows more flow through the valve when the pressure reaches over the set pressure point.
Setting Points of Flow The Relief Valve remains closed until the Set-Pressure is reached. When the Set-Pressure is met or exceeded, the spring will compress, allowing the valve to open and flow to occur.It is therefore typical to specify the maximum capacity of a back pressure relief valve at 10% and 20% over set pressure.
How to Size - 3040 Series
The Relief Valve remains closed until the Set-Pressure is reached. When the Set-Pressure is met or exceeded, the spring will compress, allowing the valve to open and flow to occur. It is standard practice to publish flow values at 10% and 20% over the Set-Pressure. The flow rate thru the valve is a function of seat opening and differential pressure across the valve.
Example
A 1” Valve set at 50 PSIG will pass 35.6 GPM of water if the system pressure exceeds the set point by 20%
Model Code: 3040-14-N-2-V Set at 50 PSI (3040 Series, 1” NPT, 20-70 PSIG Spring Range, with a Factory Set Relief Pressure of 50 PSIG)
Full Capacity Chart
Model Coding for 3040 Series
Example Model Code:
3040-15-N-3-V (3040 Series, 1 1/4” NPT, 5-35 Relief Pressure)
Must Specify Spring Code when Ordering: Use the 3040 Series Spring Selection Table to specify the proper spring(s) based on valve size and reduced pressure range by Replacing the “X” with Spring Code from chart.
Water, Liquid, Air: The 3040 Back Pressure Relief Valve offers a much higher capacity than the R Series. Used for Liquid service. Relief Valves protect systems from over-pressurized conditions. Also used for pump protection.The R Series are economically-priced Back Pressure Relief Valves for Liquid service. Relief Valves/Back Pressure Valves are used to maintain a specific back pressure or to protect systems from an over-pressure condition. Also used for pump protection.