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Pressure Relief Valves

855 Series Pressure Relief Valve

This threadless, cartridge safety pressure relief valve is designed for installation into metal manifolds. The 8 mm relief valve’s locking end uses the field-proven Lee Controlled Expansion Principle to provide secure retention and eliminate the need for threads, O-rings, or secondary retainers. This direct-acting valve features all stainless steel construction including a high quality metal seat that delivers low leakage, repeatable cracking pressure, fast response time, low hysteresis, and long life. The valve is 100% functionally tested to ensure performance.

Key Product Facts
  • Mounting Configuration:Insert - Into Metal
  • Diameter:7.95 mm
  • Full Open Lohm Rate:120 Lohms
  • Maximum Working Pressure:280 bar
  • Relief Pressure Range:100 to 550 kPa

Product Information

General Performance
Characteristic Specification
Full Open Lohm Rate 120 Lohms
Leakage 20 SCCM (max) at 172 kPa (25 psid) on Air
Maximum Working Pressure Checked Direction 280 bar
Maximum Working Pressure Differential Flow Direction 40 bar
Installation Force 680 kgf (max)
Materials
COMPONENT MATERIAL
Body 303 Stainless Steel
Cage 305 Stainless Steel
Pin 416 Stainless Steel
Spring 302/17-7 Stainless Steel
Ball 440C Stainless Steel
Assembly is pre-lubricated for proper installation. Do not clean prior to installation.
Flow Curve
Cross Section Views
Dimensional Views
Installation Hole Details

Part Numbers & Specifications

This table below contains the part numbers and technical specifications for this product. If you have specific questions, need a quote, or would like to request a handbook or drawing, click the red request button in the column on the far right.

Part Numbers & Specifications
Filter Part Numbers
FLOW DIRECTION
SPRING MATERIAL
PART NUMBER
FLOW DIRECTION
LOHM RATE CRACKING PRESSURE
SPRING MATERIAL
INSTALLATION HOLE DRAWING NUMBER APPROXIMATE WEIGHT Request Information
PCFM3800210S Forward 120 Lohms 100 +/- 15 kPa (14.5 +/- 2.2 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800215S Forward 120 Lohms 150 +/- 22.5 kPa (21.8 +/- 3.3 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800220S Forward 120 Lohms 200 +/- 30 kPa (29 +/- 4.4 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800225S Forward 120 Lohms 250 +/- 37.5 kPa (36.3 +/- 5.4 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800230S Forward 120 Lohms 300 +/- 45 kPa (43.5 +/- 6.5 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800235S Forward 120 Lohms 350 ± 52.5 kPa (50.8 ± 7.6 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800240S Forward 120 Lohms 400 ± 60 kPa (58 ± 8.7 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800250S Forward 120 Lohms 500 ± 75 kPa (72.5 ± 10.9 psid) 302 Stainless Steel 1INST003066S 1.85 grams Request
PCFM3800255S Forward 120 Lohms 550 ± 82.5 kPa (79.8 ± 12 psid) 17-7 Stainless Steel 1INST003066S 1.85 grams Request
PCRM3800210S Reverse 120 Lohms 100 +/- 15 kPa (14.5 +/- 2.2 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800215S Reverse 120 Lohms 150 +/- 22.5 kPa (21.8 +/- 3.3 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800220S Reverse 120 Lohms 200 +/- 30 kPa (29 +/- 4.4 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800225S Reverse 120 Lohms 250 +/- 37.5 kPa (36.3 +/- 5.4 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800230S Reverse 120 Lohms 300 +/- 45 kPa (43.5 +/- 6.5 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800235S Reverse 120 Lohms 350 ± 52.5 kPa (50.8 ± 7.6 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800240S Reverse 120 Lohms 400 ± 60 kPa (58 ± 8.7 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800250S Reverse 120 Lohms 500 ± 75 kPa (72.5 ± 10.9 psid) 302 Stainless Steel 1INST002350S 2.3 grams Request
PCRM3800255S Reverse 120 Lohms 550 ± 82.5 kPa (79.8 ± 12 psid) 17-7 Stainless Steel 1INST002350S 2.3 grams Request
Clear Filters
Cracking pressure is defined as the pressure at which uprun flow exceeds 50 SCCM of air.

Installation & Accessories

Installation & Manufacturing Tools
Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CCRT0900150S 855 Series Installation Tool
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Questions?

From plugs to solenoid valves, there’s a vast array of products that The Lee Company can offer. If you’d like to discuss the best solution for your specific application or to learn more about our capabilities, use-cases, or quality standards, contact your local Lee sales engineer.