63EG Relief Valve
63eg 98hm regulator
63EG relief valve (2)
fisher 63eg 98hm
fisher 63eg

63EG Relief Valve

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Product Introduction

Overview

The Fisher Type 63EG relief valve is a pilot-operated relief valve and back-pressure regulator designed for precise over-pressure protection and stable upstream pressure control. Suitable for both gas and liquid service, the 63EG provides reliable performance in pipelines, separators, vessels, storage tanks, fuel gas systems, and general industrial process applications.
Built with multiple body sizes, materials, and pilot options, the 63EG Series offers wide adaptability-from low-pressure gas networks to high-capacity industrial systems. Its quick-change trim and top-entry body structure make field maintenance extremely efficient.

Key Features

Pilot-Operated Design
Provides accurate control and fast response to pressure changes using compatible pilots such as the Fisher 6358 Series.

Dual-Service Capability (Gas or Liquid)
Suitable for natural gas, fuel gas, industrial gases, hydrocarbons, water, and various process liquids.

Wide Body Size Range
Available in NPS 1, 2, 3, 4, 6, 8×6, and 12×6 to support small to very large flow requirements.

Flexible End Connections
NPT, CL150/300/600 flanges, PN flanges, socket weld, and butt weld configurations.

Wide Relief / Set Pressure Range
Typical range from 10 to 400 psig (0.69–27.6 bar) depending on body rating and pilot selection.

Quick-Change Trim Package
Allows inline maintenance without removing the valve from the pipeline.

Optional Whisper Trim
Reduces noise in gas applications and ensures quieter operation in residential or urban environments.

product-795-525

Specifications

Parameter	Description
Valve Type	Pilot-operated relief valve / back-pressure regulator
Media	Gas or liquid
Body Sizes	NPS 1 / 2 / 3 / 4 / 6 / 8×6 / 12×6
End Connections	NPT, CL150/300/600 RF/FF flanges, PN flanges, BWE/SWE
Max Inlet Pressure	Up to 400 psig (27.6 bar), depending on body rating
Set Pressure Range	Approx. 10–400 psig
Trim Options	Metal plug, soft seat, optional corrosion-resistant materials
Maintenance	Quick-change trim, top-entry design
Optional Features	Whisper Trim™ cage, position monitoring bracket, pilot variants

Available Variants / Constructions

While 63EG relief valve represents the main product family, the series includes multiple constructions differing by pilot type, trim materials, flow capacity, and noise-reduction features.

Variant	Description
63EG + 6358 Pilot (Standard)	Standard configuration for both gas and liquid relief/back-pressure applications.
High-Pressure / Alloy-Trim Version	For corrosive or high-pressure applications in oil & gas and chemical plants.
Whisper Trim Version	Ideal for noise-sensitive gas applications.
High-Capacity Large-Body Version (NPS 8×6 / 12×6)	Designed for pipelines, separators, tank farms, and high-flow industrial systems.