Parallel Slide Gate Valve
High-temperature gate valve with parallel disc design for steam and power plant applications.
Technical Specifications
| Type | Parallel Slide |
| Size Range | 2" to 24" (50 mm to 600 mm) |
| Body Materials | Carbon Steel (WCB, WC6, WC9), Stainless Steel |
| Trim | Stellite faced, SS410, SS316 |
| Seat Material | Metal to Metal, Hardfaced |
| End Connections | Flanged, Butt Weld |
| Pressure Rating | Class 150 / 300 / 600 / 900 |
| Standards | API 600, BS 1873, ASME B16.34 |
Applications
High temperature steam, power plants, refineries
About the Parallel Slide Gate Valve
The parallel slide gate valve uses two parallel flat discs (rather than a tapered wedge) held apart by a spring between them. On closing, the disc assembly descends into the valve body and the downstream disc is pressed by line pressure differential against the downstream seat ring, while the upstream disc floats against the upstream seat. This spring-energised parallel contact sealing mechanism eliminates the main weakness of wedge gate valves in high-temperature steam service: thermal locking. A wedge gate valve can seize in the closed position when the valve cools down after being closed at operating temperature - the thermal contraction of the wedge tightens it between the seats. The parallel slide design avoids this because the sealing force is provided by line pressure, not by mechanical wedging action.
For power plant steam applications at temperatures above 400°C, parallel slide gate valves with Stellite-faced seat rings and discs are the design of choice. They allow confident operation after thermal cycling - valve opens reliably even after extended shutdowns at elevated temperature, which is critical in power station steam systems. Vajra Industrial Solutions supplies parallel slide gate valves in sizes 2" to 24" in WCB, WC6 (1.25Cr-0.5Mo), WC9 (2.25Cr-1Mo), and P91 body materials to API 600 and BS 1873, with full PWHT and PMI documentation.
Where It's Used
Key industries and applications for the Parallel Slide Gate Valve
Power plant main steam and hot reheat systems
Class 600–900 WC9 or P91 parallel slide gate valves for turbine isolation, steam dump, and emergency stop duties; Stellite-faced trim provides reliable seating after thousands of thermal cycles
Industrial boiler steam distribution
WC6 parallel slide gate valves on HP/IP steam headers at 500–565°C; non-locking design ensures valve opens after extended overnight shutdowns without steam hammer or seat damage
Refinery process heater inlet and outlet
alloy steel parallel slide gate valves for hot oil, vacuum residue, and coker heater services at elevated temperature where wedge gate design would thermally lock
District heating and CHP plants
Class 300–600 Carbon Steel parallel slide gate valves on steam supply headers and condensate return; extended gland life due to reduced packing compression versus wedge designs
Chemical plant high-temperature steam users
WCB or WC6 parallel slide gate valves on reboiler steam supply, reactor heat-up systems, and autoclave steam inlet where isolation reliability after hot standby is essential
How to Choose the Right Parallel Slide Gate Valve
Specify a parallel slide gate valve over a wedge gate valve when: (a) operating temperature is above 400°C (steam or hot process fluids) and thermal cycling is frequent; (b) the valve must be guaranteed to open reliably after cooling to ambient while in the closed position; or (c) Stellite hard-faced seating surfaces are required for erosive high-temperature service. For cold service, general process, and water applications below 300°C, a wedge gate valve is simpler and less expensive.
Popular Configurations
Most commonly ordered specifications for the Parallel Slide Gate Valve
Frequently Asked Questions
About Parallel Slide Gate Valve - ordering, specs, delivery & compliance
What standards does the Parallel Slide Gate Valve comply with?+
Our Parallel Slide Gate Valve complies with API 600, BS 1873, ASME B16.34. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Parallel Slide Gate Valve?+
The Parallel Slide Gate Valve is available in Carbon Steel (WCB, WC6, WC9), Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Parallel Slide Gate Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Parallel Slide Gate Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered gate valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Parallel Slide Gate Valve?+
The Parallel Slide Gate Valve is available in pressure ratings of Class 150 / 300 / 600 / 900. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Parallel Slide Gate Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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