Skip to content
      • Contact Us
      • Quality & Commitment
      WL Hamilton CompanyWL Hamilton Company
      • Menu
      •        
      • Quote for quantities over 100
      • Quote for custom machined parts
      • Spray Guns
      • Valves
      • Nozzles & Fittings
      • Pressure Gauges
      • Parts & Accessories
        • EMAIL US
        • 269.781.3100
      • Cart
        Cart

        No products in the cart.

        Return to shop

        • EMAIL US
        • 269.781.3100
      • Cart
        Cart

        No products in the cart.

        Return to shop

      Pressure Relief Valves

      Home / Valves / Pressure Relief Valves
      Filter

      Showing 1–16 of 24 results

      METAL / MATERIAL
      • Aluminum (6)
      • Brass (14)
      • Lead Free Brass (4)
      INLET SIZE
      • 1/4" MNPT (2)
      • 3/8" MNPT (1)
      • 1/2" MNPT (5)
      • 1/2" MPT (2)
      • 3/4" MNPT (8)
      • 3/4" MPT (2)
      • 1" MPT (2)
      • 1-1/4" MPT (1)
      OUTLET SIZE
      • 1/4" FNPT (2)
      • 3/8" FNPT (1)
      • 1/2" FNPT (5)
      • 1/2" FPT (2)
      • 3/4" FNPT (8)
      • 3/4" FPT (4)
      • 1-1/4" MPT (1)
      PSI RATING
      • 0-100 (2)
      • 0-150 (4)
      • 0-200 (5)
      • 0-300 (6)
      • 0-400 (1)
      • 200-500 (2)
      • 300-600 (4)
      Hamilton  Brass Pressure Relief Valve with Stainless Steel Ball
      Quick View
      Out of stock

      Pressure Relief Valves

      Hamilton Brass Pressure Relief Valve with Stainless Steel Ball

      $39.39
      Hamilton 1-1/4" Lead Free Brass Safety Release Valve
      Quick View
      Out of stock

      Pressure Relief Valves

      Hamilton 1-1/4″ Lead Free Brass Safety Release Valve

      $100.39
      Hamilton 1" Brass Safety Release Valve
      Quick View

      Pressure Relief Valves

      Hamilton 1″ Brass Safety Release Valve

      $60.89
      Hamilton 1" Lead Free Brass Safety Release Valve
      Quick View

      Pressure Relief Valves

      Hamilton 1″ Lead Free Brass Safety Release Valve

      $72.39
      Hamilton 1/2" Aluminum By-Pass Pressure Relief Valve, 0-300 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 1/2″ Aluminum By-Pass Pressure Relief Valve, 0-300 PSI

      $25.39
      Hamilton 1/2" Aluminum By-Pass Pressure Relief Valve, 300-600 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 1/2″ Aluminum By-Pass Pressure Relief Valve, 300-600 PSI

      $39.39
      Placeholder
      Quick View
      Out of stock

      Pressure Relief Valves

      Hamilton 1/2″ Brass By-Pass and Pressure Relief Valve, 0-300 PSI

      $39.39
      Hamilton 1/2" Brass Pressure Relief Valve with Rubber Seat, 0-150 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 1/2″ Brass Pressure Relief Valve with Rubber Seat, 0-150 PSI

      $39.39
      Hamilton 1/2" Brass Safety Release Valve
      Quick View

      Pressure Relief Valves

      Hamilton 1/2″ Brass Safety Release Valve

      $39.99
      Hamilton 1/2" Lead Free Brass Safety Release Valve
      Quick View

      Pressure Relief Valves

      Hamilton 1/2″ Lead Free Brass Safety Release Valve

      $52.89
      Hamilton 1/4" Brass By-Pass and Pressure Relief Valve, 0-150 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 1/4″ Brass By-Pass and Pressure Relief Valve, 0-150 PSI

      $29.19
      Hamilton 1/4" Brass By-Pass and Pressure Relief Valve, 0-300 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 1/4″ Brass By-Pass and Pressure Relief Valve, 0-300 PSI

      $29.19
      Hamilton 3/4" Aluminum By-Pass Pressure Relief Valve, 0-200 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 3/4″ Aluminum By-Pass Pressure Relief Valve, 0-200 PSI

      $46.69
      Hamilton 3/4" Aluminum By-Pass Pressure Relief Valve, 0-300 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 3/4″ Aluminum By-Pass Pressure Relief Valve, 0-300 PSI

      $47.69
      Hamilton 3/4" Aluminum By-Pass Pressure Relief Valve, 200-500 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 3/4″ Aluminum By-Pass Pressure Relief Valve, 200-500 PSI

      $39.79
      Hamilton 3/4" Aluminum By-Pass Pressure Relief Valve, 300-600 PSI
      Quick View

      Pressure Relief Valves

      Hamilton 3/4″ Aluminum By-Pass Pressure Relief Valve, 300-600 PSI

      $49.99
      • 1
      • 2

      BEST SELLERS

      Hamilton #10 1/4" FNPT Brass Boomless Flat Spray Nozzle
      Quick View

      Nozzles

      Hamilton #10 1/4″ FNPT Brass Boomless Flat Spray Nozzle

      $30.30
      Hamilton Telescoping Handwand Spray Gun
      Quick View

      Spray Guns

      Hamilton Telescoping Handwand Spray Gun

      Rated 5.00 out of 5
      $20.19
      Hamilton 1/4" NPT Adjustable Nozzle
      Quick View

      Nozzles

      Hamilton 1/4″ NPT Adjustable Nozzle

      Rated 5.00 out of 5
      $7.99
      Hamilton Agri-Jet Trigger Spot Spray Gun with 18" Extention
      Quick View
      Out of stock

      Spray Guns

      Hamilton Agri-Jet Trigger Spot Spray Gun with 18″ Extention

      $47.89
      Hamilton 21" Aluminum Trigger Gun with Trigger Lock
      Quick View

      Spray Guns

      Hamilton 21″ Aluminum Trigger Gun with Trigger Lock

      $75.29

      WHY WLH PRODUCTS

      WLH CO., LLC has been an agricultural industry supplier for more than 70 years with a complete line of sprayers, valves, nozzles, accessories and more.
      View our Privacy Policy

      Commitment to Quality

      From casting, machining, and assembly, our products are produced right here in our Michigan facility using only the highest quality materials.

      Read More

      Water Service Products

      Pressure relief valves, agricultural spray guns, unloader valves, spray nozzles, accessories, complete sprayers, replacement parts, and other water service products.

      Find what you need
      • Contact Us
      • Quality & Commitment
      Copyright © 2025 WLH CO. LLC -
      • Spray Guns
      • Valves
      • Nozzles & Fittings
      • Pressure Gauges
      • Parts & Accessories
      • Sign Up
      • Quote for quantities over 100
      • Quote for custom machined parts

      Login

      Lost your password?