Contact mdi

Get Free Quote:
Contact Form
sales@
eatonfiltrationsales.com

Talk With Us:
Chat Live!
Hours: 7:30am - 5:30PM ET
Monday - Friday

 Hours:
7:30am - 5:30PM ET
Monday - Friday

Type 31L-ST

Eaton Gas/Liquid Separators

Removes 99% of particles ≥ 10 µm

Computer-generated image of a Type 31L-ST gas-liquid separator.

  Models

Technical Specifications

Drag your finger across the table to scroll

  Pipe Size 25 psig 50 psig 100 psig 150 psig 200 psig 250 psig
Max.
Air
Flow
Rating
(SCFM)
1" 82 110 155 190 220 255
1-¼" 130 175 245 300 345 400
1-½" 185 245 345 425 485 560
2" 330 445 620 770 870 1000
2-½" 500 680 945 1170 1350 1550
3" 750 1000 1400 1750 1950 2300
4" 1350 1750 2500 3050

Rated ΔP (psi) 0.88 0.99 1.19 1.40 1.60 1.85
Orifice* Dia. 1/8" | 5/32" 1/8" | 5/32" 1/8" 1/8" 1/8" 1/8"
Liquid Discharge (lb/hr) 265 | 790 427 | 1273 625 760 590 650

* 5/64" orifice available for pressures up to 250 psig, but code stamp not available over 160 psig.

  Features

Eaton’s Type 31 L-ST Gas/Liquid Separators automatically remove 99% of all liquid and solid entrainment particles 10 microns in size or larger from air, gas, and steam processes.

Features/Benefits

  • Lightweight, compact
  • Removes 99% of liquid and solid entrainment particles larger than 10 microns
  • Integral trap
  • High efficiency over wide flow range
  • No required maintenance
  • Economical choice for most applications
  • Gas, steam, or air applications

Options

  • Trap heater

Low Profile Design

The Type 31L-ST Gas/Liquid Separator is a horizontal, in-line separator. It is very compact and can be supported by the line in which they are installed, no cumbersome, expensive support stands are required. The compact design of these separators take up little more than the space of the pipeline. An important consideration in space restricted applications.

Vortex Containment Plate

Moisture laden gas enters the inlet of the separator where it is deflected by Eaton’s unique Cenpellar™ into a centrifugal motion. The entrained solids and moisture droplets are separated out by a reduction in velocity. Separated liquid and solids fall into the separators integral drain trap where Eaton’s exclusive Vortex Containment Plate (VCP) ensures that they cannot be re-entrained. The VCP is constructed with a series of carefully placed rings and plates that shield the separated liquid from the vortex action within the separator to prevent re-entrainment . The VCP also helps direct the liquid to the drain trap while at the same time moves the clean, dry gas to the separator outlet. With Eaton’s exclusive VCP the need for expensive, delicate baffles that are used in ordinary separators is eliminated.

Integral Drain Trap

All Eaton Type 31 L-ST Separators come with standard, integral drain traps. This design saves space, reduces installation costs and eliminates the need to properly size and source a properly designed drain trap to work with the separator. The integral trap automatically ejects the condensate at predetermined levels without loss of line pressure. Internal trap parts are made of stainless steel and include a non-magnetic 18-8 stainless steel valve and seat. Removal of a flange releases the trap mechanism for inspection. A heater option, Type STH, is also available for applications below freezing. A 50 watt, 100 Volt, self limiting heating element keeps the reservoir fluid from freezing. The heater does not increase the line temperature and can be easily removed for inspection.

Engineering specification

All gas/liquid separators shall be constructed of cast iron with (threaded or flanged) connections (with ASME Code Stamp). Separators will remove 99% of entrained liquid or particles 10 microns in size or larger when correctly installed. All separators shall have integral drain trap (with heater). Re-entrainment will be prevented by a Vortex Containment Plate. Separators shall be Eaton Type 31L-ST.

  Dimensions

CAD drawing showing the dimensions of a flanged Type 31L-ST separator.

Flanged Dimensions

Drag your finger across the table to scroll

Pipe Size in (mm) Drain
NPT
Weight - lbs (kg)
A B (ST) B (STH) C D E ST STH
3 25 (635) 9 (229) 10.12 (257) 6.75 (171) 7.63 (194) 0.81 (21) ½ 115 (52) 118 (54)
4 27.25 (692) 9.88 (251) 11 (279) 6.75 (171) 9.63 (244) 0.81 (21) ½ 160 (73) 175 (79)

NOTE: 1/8" orifice is standard. For other sizes, please consult your mdi sales representative.




CAD drawing showing the dimensions of a threaded Type 31L-ST separator.

Threaded Dimensions

Drag your finger across the table to scroll

Pipe Size in (mm) Drain
NPT
Weight - lbs (kg)
A B (ST) B (STH) C D E ST STH
1 19 (483) 8 (203) 9.125 (232) 6.75 (171) 5.56 (141) 0.81 (21) ½ 62 (28.1) 65 (29.5)
1-¼ 19 (483) 8 (203) 9.125 (232) 6.75 (171) 5.56 (141) 0.81 (21) ½ 62 (28.1) 65 (29.5)
1-½ 19 (483) 8 (203) 9.125 (232) 6.75 (171) 5.56 (141) 0.81 (21) ½ 61 (27.7) 64 (29)
2 18 (457) 8 (203) 9.125 (232) 6.75 (171) 5.56 (141) 0.81 (21) ½ 60 (27.2) 63 (28.5)
2-½ 22.75 (578) 9 (229) 10.12 (257) 6.75 (171) 7.63 (194) 0.81 (21) ½ 92 (41.7) 95 (43)
3 21 (533) 9 (229) 10.12 (257) 6.75 (171) 7.63 (194) 0.81 (21) ½ 90 (40.8) 93 (42.1)

  Contact mdi

Please fill out the form below and your personal mdi product expert will email you your quote. The more information that you provide the quicker we can send you a quote. Sending an incomplete quote request could mean that we have to contact you for necessary information before sending your quote. And know that our knowledgeable sales staff is standing by to help you with your order and with any questions.






Please include your contact information so that we may reply to your request. Your contact information is private and will not be sold to any third party or used negatively in any way.














mdi does not advertise prices online. The cost of products is subject to change over time. In order to extend to you the best price that we can offer, we prefer to create written and emailed quotes which reflect any discounts or promotions currently available. Some products can be quoted over the phone, and expediting quotes and orders is always available per request.

See our Terms and Conditions for more information about the mdi sales process.


Call us any time Monday through Friday 7:30 AM to 6:30 PM ET.

Phone: (727) 835-0665 | Toll Free: 800-761-4298
Fax: (727) 571-0422 | Email or Fill Out the Form Above