In-Line Vent Valve Model 800-PSO

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Technical Data

Sesco SKU:tp-064 Category: Brand:

Available on backorder


Series 800 Pressure Only vent valves are designed to relieve pressure only through the vent line. By omitting the vacuum side of the valve they
eliminate the possibility of a two way flow. These are designed the same as the “SO” pressure/vacuum series except they eliminate the vacuum side of the valve. All valves are lined and trimmed with plastic where moving parts or surfaces may become fouled by crude gasses or materials.


Features & Benefits

• All intemal working parts are made from a “PPS” (Polyphenylene Sulfide) plastic material for superior corrosion resistance which resists freezing and sticking with operating ranges from -45° C to 260° C.
• Multiple setting options by adding additional pressure weights

• Viton gaskets for “Sour Gas” and corrosive service applications
• Non-Corrosive coating option for extremely harsh environments
• Certified flow capacities in accordance with API


Vent Settings Range

  • Model numbers: Model 820-PSO, Model 830-PSO, Model 840-PSO,
  • Sizes Available: 2″ through 4”
  • Pressure: 4.3 to 69.0 mbar
  • Vacuum: 1.7 mbar


Model 800-PSO In-Line Vent Valve Parts List

model 800-pso in-line parts

Ref. No.Part Description2 inch3 inch4 inch
1Valve BodyA2VS01A3VS01A4VS01
3Cap Gasket2V3G3V3G4V3G
7Eyebolt Pin5-C5-C5-C
8Cap Hinge Pin5-N5-B5-B
9Hinge Pin ClipHPC-148HPC-148HPC-148
12Pressure Disc2P4P3P4P4P4P
13Pressure Gasket2P4G3P4G4P4G
16Pressure Seat2P4P-33P4P-34P4P-3
18Slip-On FlangeO-2O-3O-4
19Flange GasketS-2-GS-3-GS-4-G
20Bolt & Nut1/2x13x2-1/21/2x13x31/2x13x3
21Pressure Weight2-PW-13-PW-14-PW-1