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The valve is supplied from the factory pre-set at 50 psig.  To increase the pressure setting, back off 
the lock nut located beneath the colour coded bonnet cap.  Turn the Allan bolt 

using a 5/16” or #8 

hex key clockwise to increase pressure setting or counter clockwise to reduce pressure setting.  
Approximately one (1) full turn of the handle is equal to 10 psig. 
 
If maintenance is required on the valve: 

1.  Ensure that the valve is 

properly isolated

 from the line, 

not under pressure

 and 

properly 

flushed

 of chemical before proceeding to disassembly. 

 

2.  Turn Allan bolt on the top of valve, counterclockwise until all spring pressure is released 

before 

proceeding to undo retaining nuts, to remove top of valve for diaphragm 

replacement. 

 

3.  All working components ie. diaphragm, spring can be accessed by removing the four 

retaining bolts located on the bottom of the valve (item # 9 of parts breakdown). 

Use a 3/16” 

Allan key or #5 hex key to remove the retaining bolts. 

 

4.  When replacing a PTFE coated diaphragm, ensure the PTFE coated side of the diaphragm 

is facing down when viewed from the top of the valve.  The installed diaphragm also 
functions as the body seal. (Torque nuts to 40 inch pounds when reassembling) 

 

Installation and Maintenance of Pressure Relief Valves: 
 

Pressure relief valves are installed on the discharge line of a pump and should be located as close 
as possible to the metering pump.  The valve is of a two port design and is required to be installed 
on a branch tee for piping back to the supply tank or feed side of the pump. 
 
Never install shut-off/isolation valves between pump discharge and in-line pressure relief valves.  
When using in conjunction with a back pressure control valve, always install back pressure valve 
downstream of pressure relief valve.  The relief port on the pressure relief valve should be piped 
back to the feed tank or suction side of the pump (see typical installation schematics). 
 

Caution:  The plastic valve bodies have standard threads, which are tapered. 

When installing pipe into the body, hand tighten only to avoid cracking

 

 
Gauge Installation Instructions: 
 

For the convenience of pressure setting and reading, there are two ports provided one on either 
side of the valve body. These ports are normally not drilled or tapped unless initially ordered that 
way. To drill and tap the ports it is recommended that you first disassembly the valve so as to not 
leave any foreign particles in the valve

. You will require a 1/8” or 3.264 mm drill bit to drill out the 

centre point of the gauge port opening into the body of the valve. The port is already the correct 
diameter 

for the tapping of a ¼” or M10 thread. It is recommended that you use a 

regular tap then 

a bottoming tap to open the port up, this will allow for the proper number of gauge threads. 
 

Summary of Contents for ECO-25

Page 1: ...ation and instructions that must be read understood and followed to ensure that the equipment is installed operated and serviced in an appropriate manner Failure to do so before using may result in hazardous consequences and or improper operation Manufactured by PRIMARY FLUID 1050 Cooke Blvd Burlington Ontario L7T 4A8 SYSTEMS INC Tel 905 333 8743 Fax 905 333 8746 Call Toll Free 1 866 324 6422 E Ma...

Page 2: ...sure adjustments through the range 7 150 PSIG Eco valve is available in several configurations to meet your needs such as threaded socket flanged union in DIN BSPT and American Standard Built in downstream manual air release for ease of pump priming Built in anti siphon Back Pressure Valve Anti siphon Diaphragm Back Pressure Valves serve two primary functions The first is to provide a constant dis...

Page 3: ...he valve body the ports are normally not drilled or tapped for a gauge connection See gauge installation instructions on page 5 Caution The gauge port is solely for the installation of the gauge and cannot be used for the bleeding or venting of the system Improper operation and or hazardous consequences could result See gauge installation instructions Pressure Relief Valves Reason for Selection an...

Page 4: ...alled on the discharge line of a pump and should be located as close as possible to the metering pump The valve is of a two port design and is required to be installed on a branch tee for piping back to the supply tank or feed side of the pump Never install shut off isolation valves between pump discharge and in line pressure relief valves When using in conjunction with a back pressure control val...

Page 5: ...n of the diaphragm on the seat To adjust the valve to relieve air or gas downstream 1 Back off lock nut located beneath the colour coded handle 2 Turn handle counter clockwise until approximately 1 inch of thread is exposed 3 At this adjustment the spring has relieved all tension from the diaphragm allowing air or gas to be vented downstream ...

Page 6: ... examples only Consult your engineering department for the appropriate installation for your application or call the factory for advice Example A Solenoid Driven Pumps Rated Under 150 psig Example B System arrangement for solenoid driven above 150 psig or motor driven pumps ...

Page 7: ...7 Exploded View Back Pressure Pressure Relief Valve 1 4 ECO 25 3 8 ECO 38 1 2 ECO 50 ECO Valves ...

Page 8: ... steel Connection A NPT B BSPT C S W N A D S W Metric E Flg ASME F Flg DIN G Union Thr d Material TFE PTFE EPDM E EPDM V viton Size 25 1 4 S S valve 38 3 8 S S valve 50 1 2 S S valve Colour G Green 1 4 valve B Brown 3 8 valve Y Yellow 1 2 valve O Ring seal V viton E EPDM T PTFE encapsulated viton Connection NPT NPT BSPT BSPT SOC S W Imperial SOC M S W Metric Size 25 1 4 S S valve 38 3 8 S S valve ...

Page 9: ...trength as the temperature increases therefore the working pressure must be reduced accordingly The following factors will apply Temperature Correction Factors Thermoplastics Operating Factors Temperatures NR Not Recommended Recommended for continuous drainage pressure only F C PVC CPVC PP PVDF 70 21 1 00 1 00 1 00 1 00 80 27 0 90 0 96 0 97 0 95 90 32 0 75 0 92 0 91 0 87 100 38 0 62 0 85 0 85 0 80...

Page 10: ...10 ...

Page 11: ...nts and instructions set forth herein are based on the best information and practices known to Primary but it should not be assumed that every acceptable safety procedure is contained herein Of necessity Primary cannot guarantee that actions in accordance with such statements and instructions will result in the complete elimination of hazards and it assumes no liability for accidents that may occu...

Page 12: ...12 Notes ...

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