Pressure Seal Gate Valves for Demanding Industrial Service
Pressure Seal Gate Valves are designed for reliable isolation in demanding piping systems where pressure-assisted bonnet sealing, robust construction and dependable shut-off are important.
Pressure-Activated Bonnet Sealing for Reliable Isolation
FMV Valve Automation offers Pressure Seal Gate Valve solutions for industrial applications requiring dependable isolation under demanding operating conditions.
Unlike conventional bolted-bonnet construction, the pressure-seal arrangement uses internal fluid pressure to increase the sealing force between the body, bonnet and pressure-seal gasket.
The gate mechanism provides the primary flow isolation function, while the pressure-seal bonnet forms the body-to-bonnet sealing arrangement.
Pressure Seal Gate Valves are generally selected for full-open or full-closed service rather than continuous throttling.
Engineered for High-Pressure Isolation
Pressure Seal Gate Valves combine conventional gate-valve isolation with a pressure-energized bonnet sealing arrangement.
Pressure Seal Bonnet
Internal pressure contributes to the sealing force at the body-to-bonnet joint.
Reliable Isolation
Gate movement provides dependable isolation when the valve is operated to the fully closed position.
High-Pressure Service
Pressure-seal bonnet designs are commonly used for demanding high-pressure industrial applications.
High-Temperature Applications
Suitable pressure-seal designs can be selected for applications involving elevated operating temperatures.
Low Flow Obstruction
When fully open, the gate retracts from the primary flow passage, supporting efficient flow through the valve.
Industrial Operating Options
Depending on application requirements, suitable manual or automated operating arrangements can be considered.
How a Pressure Seal Gate Valve Works
The valve uses linear gate movement for flow isolation while the pressure-seal bonnet uses system pressure to increase the sealing force at the body-to-bonnet joint.
Valve Open
The stem moves the gate upward, removing it from the main flow passage.
Flow Passage Established
With the gate fully open, fluid can pass through the valve with relatively low obstruction.
Gate Moves Downward
Operator input moves the gate toward the seating surfaces during valve closure.
Valve Closed
The gate engages the seats and establishes the primary flow isolation.
Pressure Energizes the Bonnet Seal
As internal pressure increases, it contributes to the sealing force at the pressure-seal bonnet arrangement.
Self-Energizing Body-to-Bonnet Sealing
The defining feature of a pressure seal gate valve is the way internal system pressure contributes to bonnet sealing.
Initial Sealing
Before full operating pressure is established, the pressure-seal assembly is positioned and preloaded to establish the initial body-to-bonnet seal.
Pressure Build-Up
As internal pressure rises, force acting on the bonnet contributes to increased compression of the pressure-seal gasket.
Increased Sealing Force
The pressure-assisted arrangement increases contact force between the sealing components and helps maintain the body-to-bonnet pressure boundary.
Demanding Service
This sealing principle makes pressure-seal bonnet construction particularly relevant to high-pressure and high-temperature industrial valve applications.
Advantages of Pressure Seal Gate Valves
The pressure-seal construction provides specific benefits for demanding isolation duties.
Pressure-Assisted Sealing
Internal pressure contributes to the sealing load at the body-to-bonnet joint.
Suitable for Demanding Service
Pressure-seal designs are commonly selected for high-pressure and high-temperature industrial applications.
Compact Bonnet Arrangement
Pressure-seal construction can provide a compact alternative to conventional bolted-bonnet arrangements in suitable services.
Reliable Isolation
The gate mechanism provides the primary shut-off function when the valve is fully closed.
Industrial Applications
Pressure Seal Gate Valves are commonly considered for demanding isolation duties in energy, process and high-pressure piping systems.
Power Generation
High-pressure and high-temperature steam and utility isolation applications.
Petrochemical Plants
Process isolation duties where demanding pressure and temperature conditions require appropriate valve construction.
Refineries
Suitable process and utility line isolation in refinery systems.
Oil & Gas
Isolation applications selected according to pressure, temperature and process-medium requirements.
High-Pressure Steam
Steam isolation duties where pressure-seal bonnet construction is appropriate for the system.
Industrial Process Plants
Demanding process applications requiring reliable isolation and suitable pressure containment.
Main Components
Pressure Seal Gate Valves integrate a conventional gate mechanism with a specialized pressure-seal bonnet arrangement.
Valve Body
Forms the main pressure boundary and houses the gate, seats and internal flow passage.
Pressure Seal Bonnet
Forms the upper closure and works with the pressure-seal assembly to maintain the body-to-bonnet seal.
Pressure Seal Gasket
Provides the sealing interface between the bonnet and body and is pressure energized during operation.
Gate / Wedge
Moves linearly into or away from the flow passage to establish isolation or flow.
Valve Stem
Transfers operator movement to the gate for opening and closing.
Seat Arrangement
Provides the sealing interface between the gate and valve body during isolation.
Select According to Actual Process Conditions
Correct valve selection should consider the complete operating envelope of the piping system.
Process Conditions
Valve Configuration
Pressure Seal vs Bolted Bonnet
Both constructions can be used for gate valve isolation, but their body-to-bonnet sealing mechanisms are different. Pressure-seal construction uses internal pressure to contribute to sealing, while a bolted bonnet relies on externally applied bolt preload and gasket compression.
Why Choose FMV Valve Automation?
We focus on practical industrial valve solutions aligned with application requirements and operating conditions.
Solutions developed around industrial flow isolation and process requirements.
Support for identifying a suitable valve configuration based on actual process conditions.
Valve selection can be discussed around pressure, temperature, medium and piping requirements.
Contact the FMV team to discuss your Pressure Seal Gate Valve requirement.
Pressure Seal Gate Valve FAQs
What is a Pressure Seal Gate Valve?
A Pressure Seal Gate Valve is a gate valve incorporating a pressure-seal bonnet arrangement in which internal system pressure contributes to the body-to-bonnet sealing force.
How does a pressure seal bonnet work?
As internal pressure increases, it acts on the bonnet and pressure seal assembly, increasing compression at the sealing interface.
What is the main purpose of a Pressure Seal Gate Valve?
Its primary purpose is flow isolation in piping systems where a pressure-seal bonnet is appropriate for the operating conditions.
Are Pressure Seal Gate Valves suitable for high-pressure service?
Pressure-seal bonnet designs are commonly used in demanding high-pressure applications because internal pressure contributes to the bonnet sealing force.
Can a Pressure Seal Gate Valve be used for throttling?
Gate valves are generally intended for fully open or fully closed operation and are not normally recommended for continuous throttling.
Where are Pressure Seal Gate Valves used?
Common application areas include power generation, high-pressure steam systems, refineries, petrochemical plants, oil and gas and other demanding industrial process systems.
What information is required for valve selection?
Important information includes operating pressure, temperature, process medium, valve size, end connection, operating method and installation requirements.
Need the Right Pressure Seal Gate Valve?
Share your pressure, temperature and application requirements with FMV Valve Automation for suitable valve selection.