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Carrier 3020400 Pressure Relief Valve 400 PSI 1/2 x 5/8 " NPTFE X Flr PRV

Special Price $149.80 Regular Price $172.27
Out of stock
SKU
3020400
The Carrier 3020400 is a Pressure Relief Valve, an element crucial to the functionality of an HVAC system and whose purpose is to protect the system against pressure buildup, it is Constructed from brass, and Poly Tetra Fluoro Ethylene, and stainless steel. The water connection of this filter is 1/2” NPTFE and the inlet and outlet diameters are 1/2” and 5/8” respectively with a pressure rating of up to 400 PSI. It functions at a temperature of -40 °F to 325 °F and efficiently modulates pressure by venting off to avoid system pressure damage. Which provides system reliability and safety reducing the probability of equipment failure and improving efficiency.
Manufacturer:
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Specifications

  • Size: 3.536 x 0.94 x 0.94 "
  • Body Material: Brass
  • Composition: Brass, PTFE, Stainless Steel
  • Connection Size: 1/2 "
  • Connection Type: NPTFE
  • Inlet Connection Size: 1/2 "
  • Outlet Connection Size: 5/8 "
  • Prop 65: Yes
  • Temperature Range: -40°F to 325°F (-40°C to 162.78°C)
  • Weight: 0.54lb
  • Pressure: 400 PSI
Manufacturer Name: Carrier
Product Number: 3020400
OEM Part Number: 3020400
Product Description: 400# 1/2X5/8 Nptfe X Flr Prv
Weight:0.54lbs/244.94g

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Customer Questions
What maintenance is required for the Carrier 3020400 Pressure Relief Valve?

Inspect the pressure relief valve regularly for leakage, corrosion, or sticking of the relief mechanism. Clean external surfaces and ensure ports remain unobstructed to maintain accurate pressure release. Periodic functional testing is essential to confirm proper operation. Always depressurize the system before servicing for safety.

What are common issues with the Carrier 3020400 Pressure Relief Valve?

  • Valve may fail to open at set pressure causing overpressure risk.
  • Leakage from seat wear or debris buildup in sealing area.
  • Erratic pressure release due to spring fatigue or misalignment.
  • Blocked inlet or outlet reducing system pressure control efficiency.

Installation Steps

Step 1: Shut down system and fully relieve refrigerant pressure; use proper recovery procedures if required.

Step 2: Remove old relief valve and inspect ports for cleanliness and thread integrity.

Step 3: Apply compatible thread sealant and install new valve in correct orientation.

Step 4: Tighten to manufacturer torque specification without over-stressing fittings.

Step 5: Restore system pressure gradually and verify no leaks at connection points.

Step 6: Confirm relief setpoint operation and ensure safe discharge routing is unobstructed.