Filter By
Connection Size



Connection Type


Relief Pressure Range(PSI)



Operating Condition
Over Set Pressure
Fluid
Temperature
Load  
Filter
3040 Series

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.

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.

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.

ModelSizeTypeRelief Pressure (psig)Body MaterialMax Inlet Pressure (psig)Capacity (gpm)Weight (lbs)
3040-12-N-4-V1/2"NPT1 - 12Stainless Steel2508
3040-12-N-3-V1/2"NPT5 - 35Stainless Steel2508
3040-12-N-2-V1/2"NPT20 - 70Stainless Steel2508
3040-12-N-1-V1/2"NPT40 - 125Stainless Steel2508
3040-13-N-4-V3/4"NPT1 - 12Stainless Steel2508
3040-13-N-3-V3/4"NPT5 - 35Stainless Steel2508
3040-13-N-2-V3/4"NPT20 - 70Stainless Steel2508
3040-13-N-1-V3/4"NPT40 - 125Stainless Steel2508
3040-14-N-4-V1"NPT1 - 12Stainless Steel2509
3040-14-N-3-V1"NPT5 - 35Stainless Steel2509
3040-14-N-2-V1"NPT20 - 70Stainless Steel2509
3040-14-N-1-V1"NPT40 - 125Stainless Steel2509
3040-15-N-3-V1 1/4"NPT5 - 35Stainless Steel25015
3040-15-N-2-V1 1/4"NPT20 - 70Stainless Steel25015
3040-15-N-1-V1 1/4"NPT40 - 125Stainless Steel25015
3040-16-N-3-V1 1/2"NPT5 - 35Stainless Steel25016
3040-16-N-2-V1 1/2"NPT20 - 70Stainless Steel25016
3040-16-N-1-V1 1/2"NPT40 - 125Stainless Steel25016
3040-17-N-3-V2"NPT5 - 35Iron Body25048
3040-17-N-2-V2"NPT20 - 70Iron Body25048
3040-17-N-1-V2"NPT40 - 125Iron Body25048
3040-17-F125-3-V2"125# FLG5 - 35Iron Body25053
3040-17-F125-2-V2"125# FLG20 - 70Iron Body25053
3040-17-F125-1-V2"125# FLG40 - 125Iron Body25053
3040-17-F250-3-V2"250# FLG5 - 35Iron Body25056
3040-17-F250-2-V2"250# FLG20 - 70Iron Body25056
3040-17-F250-1-V2"250# FLG40 - 125Iron Body25056
Product Overview
The 3040 Series Back Pressure Valves relieve upstream pressure 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.
Features
• Fast response
• Viton Trim for 300°F service
• Soft “Seat” for tight shut-off
How It Works
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 in crease 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 pressure 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.

Pressure Adjustments :

Rotating the adjustment screw clockwise increases the compression on the spring, thereby in creasing the set-pressure. Rotating the adjustment screw counter-clockwise lowers the set-pres sure. Tighten the locknut after adjustment.
Selection / Sizing / Capacities
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.

Example:
A 1” valve set at 50 PSIG will pass 35.6 GPM of water or 409 SCFM of air if the system pressure exceeds the set-point by 20%.

The 3040 Series Relief Valve water and air capacities at inlet pressures of 10% and 20% over Set-Pressure:
Options
3040 Series Spring Selection Table (**Relief Pressure 1-12 PSI (Code 4) available in 1/2"-1" sizes ONLY)
Dimension and Weights