Close Menu
Lee Locations around the world
The Lee Company In the UK
The Lee Company in Germany
The Lee Company in France
The Lee Company In Italy
The Lee Company in Scandinavia
See Global Distributors and Agents
Back
Back
Back
Back
Back
This product is not available for your industry
View Pressure Relief Valves for
Pressure Relief Valves

558 Series Pressure Relief Valve

This threadless, cartridge safety pressure relief valve is designed for installation into metal manifolds. The 5.5 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.

Contact a Lee Sales Engineer Find Another Product
Key Product Facts
  • Mounting Configuration:Insert - Into Metal
  • Diameter:5.47 mm
  • Full Open Lohm Rate:250 Lohms
  • Maximum Working Pressure:280 bar
  • Relief Pressure Range:100 to 550 kPa
For More Information

Product Information

General Performance
Characteristic Specification
Full Open Lohm Rate 250 Lohms
Leakage 10 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 625 kgf (max)
Materials
COMPONENT MATERIAL
Body 303 Stainless Steel
Cage 305 Stainless Steel
Pin 416 Stainless Steel
Spring 302 Stainless Steel
Ball 440C Stainless Steel
Assembly is pre-lubricated for proper installation. Do not clean prior to installation.
Flow Curve
Cross Section Views
Relief Flow Forward Configuration
Dimensional Views
Relief Flow Forward Configuration
This image is for reference only. All dimensions are in millimeters.
*Overall length before installation.
Installation Hole Details
Relief Flow Forward Configurations
Installation Hole Drawing Number: 1INST007226S
This image is for reference only. All dimensions are in millimeters.

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
Part Number
Flow Direction
Lohm Rate Cracking Pressure Installation Hole DRAWING NUMBER APPROXIMATE WEIGHT Request Information
PCFM2550210S Forward 250 Lohms 100 +/- 15 kPa (14.5 +/- 2.2 psid) 1INST007226S 0.7 grams Request
PCFM2550215S Forward 250 Lohms 150 +/- 22.5 kPa (21.8 +/- 3.3 psid) 1INST007226S 0.7 grams Request
PCFM2550220S Forward 250 Lohms 200 +/- 30 kPa (29 +/- 4.4 psid) 1INST007226S 0.7 grams Request
PCFM2550225S Forward 250 Lohms 250 +/- 37.5 kPa (36.3 +/- 5.4 psid) 1INST007226S 0.7 grams Request
PCFM2550230S Forward 250 Lohms 300 +/- 45 kPa (43.5 +/- 6.5 psid) 1INST007226S 0.7 grams Request
PCFM2550235S Forward 250 Lohms 350 ± 52.5 kPa (50.8 ± 7.6 psid) 1INST007226S 0.7 grams Request
PCFM2550240S Forward 250 Lohms 400 ± 60 kPa (58 ± 8.7 psid) 1INST007226S 0.7 grams Request
PCFM2550250S Forward 250 Lohms 500 ± 75 kPa (72.5 ± 10.9 psid) 1INST007226S 0.7 grams Request
PCFM2550255S Forward 250 Lohms 550 ± 82.5 kPa (79.8 ± 12 psid) 1INST007226S 0.7 grams Request
PCRM2550210S Reverse 250 Lohms 100 +/- 15 kPa (14.5 +/- 2.2 psid) 1INST002604S 0.85 grams Request
PCRM2550215S Reverse 250 Lohms 150 +/- 22.5 kPa (21.8 +/- 3.3 psid) 1INST002604S 0.85 grams Request
PCRM2550220S Reverse 250 Lohms 200 +/- 30 kPa (29 +/- 4.4 psid) 1INST002604S 0.85 grams Request
PCRM2550225S Reverse 250 Lohms 250 +/- 37.5 kPa (36.3 +/- 5.4 psid) 1INST002604S 0.85 grams Request
PCRM2550230S Reverse 250 Lohms 300 +/- 45 kPa (43.5 +/- 6.5 psid) 1INST002604S 0.85 grams Request
PCRM2550235S Reverse 250 Lohms 350 ± 52.5 kPa (50.8 ± 7.6 psid) 1INST002604S 0.85 grams Request
PCRM2550240S Reverse 250 Lohms 400 ± 60 kPa (58 ± 8.7 psid) 1INST002604S 0.85 grams Request
PCRM2550250S Reverse 250 Lohms 500 ± 75 kPa (72.5 ± 10.9 psid) 1INST002604S 0.85 grams Request
PCRM2550255S Reverse 250 Lohms 550 ± 82.5 kPa (79.8 ± 12 psid) 1INST002604S 0.85 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
CCRT0900120S 558 Series Installation Tool

CAD Envelopes

Resources

Get in touch

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.

Please provide your information to access the content.

Thank You.

Your download has started.

Request Information for Part #

We’re always ready to be your engineering partner. Fill out this form below so we can provide the solution you need.

Thank you for your inquiry.

We have received your inquiry and a member of our team will be in contact shortly to provide more information. Thank you for contacting The Lee Company!

The Lee Company has developed the Lohm Laws for defining and measuring resistance to fluid flow. The Lohm is defined such that 1 Lohm will flow 100 GPM of water with a pressure drop of 25 psi at a temperature of 80°F.

Lohms for Liquids Lohms for Gases