High Pressure Pilot Operated Safety Relief Valve for Industrial Steam Systems
GIS Valve® by Greno Industries
The GIS Valve® is a hydraulic pilot operated safety relief valve engineered to provide reliable overpressure protection for high-pressure steam systems in marine, utility, industrial, and power generation applications.
Designed for systems operating up to 3000 PSI and 1100°F, the GIS Valve delivers exceptional operational reliability, improved safety, reduced steam leakage, and simplified maintenance compared to conventional safety valves.
Originally developed for the U.S. Navy in 1978, the GIS Valve has since been installed on more than 400 non-nuclear Navy vessels and is trusted across critical industrial steam applications worldwide.
Greno Industries manufactures the GIS Valve in Scotia, New York using precision CNC machining and AS9100:2016 / ISO9001:2015 certified quality systems. We are also ITAR registered. Watch the video below for a GIS Valve overview.
Hydraulic Pilot Operated Safety Valve System
The GIS Valve® and remote pilot panel are located away from the boiler to improve safety, reliability, and accessibility.
Unlike conventional steam safety valves, the GIS Valve uses a remote hydraulic pilot system that isolates sensitive controls from extreme boiler temperatures. This innovative design improves pressure control accuracy while helping reduce maintenance requirements and operational inefficiencies.
Why the GIS Valve Outperforms Conventional Safety Valves
The GIS Valve was engineered specifically to solve the limitations commonly associated with traditional boiler safety valve systems.
Key Performance Advantages
-
High accuracy and repeatability at peak boiler loads
-
Virtually leak-free operation
-
Reduced steam losses and improved efficiency
-
Remote pilot panel for safer operation
-
Elimination of simmering and unnecessary valve cycling
-
Simplified maintenance through modular construction
-
Stainless steel construction for long-term durability
-
Retrofit compatibility with existing steam systems
-
No external power supply required for operation
GIS Valve vs. Conventional Safety Valves
Engineered for High-Pressure Steam Applications
The GIS Valve supports demanding steam systems operating under extreme pressure and temperature conditions.
Technical Specifications
How the GIS Valve System Works
Hydraulic pilot operated boiler safety valve system showing the safety valve, pilot panel, pressure sensing lines, and water supply connections.
The GIS Valve system operates using the pressure-loading principle.
During normal operation, boiler pressure holds the safety valve closed. When the pilot valve’s set pressure is reached, the pilot valve vents the loading pressure from the safety valve, allowing the valve to open and safely relieve excess pressure.
The complete system consists of:
-
Safety valve assembly
-
Remote pilot panel
-
Pressure sensing lines
-
Hydraulic control components
-
Water supply connections
This design eliminates many common issues associated with traditional steam drum pilot valves, including excessive steam leakage, temperature instability, and exhaust piping complications.
Remote Pilot Panel Advantages
The GIS Valve’s remote pilot panel is mounted away from the boiler in a lower temperature operating environment, improving both safety and operational performance.
Benefits of Remote Pilot Operation
-
Improved pressure setting accuracy
-
Reduced exposure to hazardous operating conditions
-
Easier maintenance and adjustment access
-
More stable performance under varying temperatures
-
Elimination of steam exhaust from the pilot valve
-
Reduced maintenance and lifecycle costs
Unlike conventional pilot valves, the GIS pilot valve controls the safety valve hydraulically without exhausting steam during operation.
GIS Valve Applications
Marine & Naval Steam Systems
The GIS Valve was originally developed for demanding U.S. Navy applications where reliability and operational performance are mission critical. Today, the valve continues to support marine steam systems operating in harsh environments worldwide.
Power Generation
Utility and industrial power plants utilize the GIS Valve to improve steam pressure control, operational efficiency, and long-term system reliability in the power generation industry.
Industrial Boiler Systems
Industrial facilities benefit from simplified maintenance, retrofit flexibility, and reduced steam leakage in high-pressure steam applications.
Pulp & Paper
The GIS Valve supports continuous-duty steam operations in pulp and paper facilities where operational uptime and reliability are essential.
Retrofit Existing Steam Systems Without Complete Redesign
One of the GIS Valve’s most valuable advantages is its ability to integrate into existing steam systems without requiring a complete system overhaul.
Greno Industries can custom-engineer a GIS Valve solution to work with your current infrastructure, helping facilities modernize boiler safety systems while minimizing downtime and capital expenditures.
Precision-machined stainless steel construction supports long-term durability in demanding industrial and marine environments.
Every GIS Valve is manufactured using precision CNC machining and carefully ntrolled materials to ensure consistent performance and maximum durability.
Critical seating components utilize hard surface alloys to maximize operational life under demanding conditions while minimizing maintenance requirements.
The valve’s stainless steel construction provides exceptional resistance to corrosion, wear, and harsh operating environments.
Full-Service Engineering & Manufacturing Partner
Greno Industries provides fully integrated support from engineering through final manufacturing and testing.
Capabilities Include:
-
Engineering and design support
-
Precision CNC machining
-
CAD/CAM manufacturing
-
Assembly and testing
-
Quality inspection
-
Field support and service
-
24/7 support availability
Greno Industries combines advanced manufacturing technology with decades of steam system expertise.
Frequently Asked Questions (FAQs)
What is a pilot operated safety relief valve?
A pilot operated safety relief valve uses a secondary pilot control system to manage the opening and closing of the main relief valve. This provides more accurate pressure control and reduced steam leakage compared to conventional safety valves.
What industries use the GIS Valve?
The GIS Valve is used in marine, naval, utility, industrial boiler, power generation, and pulp and paper applications.
What pressure and temperature ranges can the GIS Valve handle?
The GIS Valve is designed for steam systems operating up to 3000 PSI and temperatures up to 1100°F.
Can the GIS Valve retrofit existing systems?
Yes. Greno Industries can engineer retrofit solutions that integrate into existing steam systems without requiring a complete redesign.
How does the GIS Valve reduce steam leakage?
The valve’s pressure-loading design eliminates many common leakage paths associated with traditional pilot-operated systems.
Is the GIS Valve manufactured in the USA?
Yes. All GIS Valves are proudly manufactured in Scotia, New York by Greno Industries.
Request a GIS Valve Consultation
Whether you are designing a new high-pressure steam system or modernizing an existing installation, Greno Industries can provide a standard or fully custom-engineered GIS Valve solution tailored to your application.
Contact Greno Industries Today
-
Request a Quote
-
Speak With an Engineer
-
Download Technical Documentation
-
Discuss Retrofit Options
Greno Industries
Scotia, New York
AS9100:2016 & ISO9001:2015 Certified
Made in USA