Unlike conventional gate valves, parallel slide gate valves boast parallel seating surfaces, ensuring uniform force distribution and minimal wear. This innovative design enhances sealing performance, rendering them perfect for applications requiring precise shut-offs and efficient fluid flow control.
Parallel gate valves incorporate a closure member with parallel faces, resembling a sliding gate. This member can either be a single disc or a twin-disc assembly.
ACEV's bolted bonnet parallel gate valves excel in clean service and steam applications. Their design leverages the primary system pressure acting on the downstream disc to maintain seat integrity, eliminating the need for wedging action or additional seat loading. Thanks to their inherent design, parallel slide valves are immune to thermal binding issues, providing a significant safety advantage in high-temperature environments.
One notable advantage of parallel gate valves is their minimal flow resistance, approaching that of a short, straight pipe in full-bore configurations. Their ability to slide the disc across the seat face also allows them to handle fluids containing suspended solids with ease.
Parallel gate valves offer diverse configurations tailored to meet the specific needs of various industrial applications:
Bolted bonnet parallel gate valves are prevalent in steam generation industries operating at low to medium pressures. Their design features a bonnet securely bolted to the valve body, facilitating easy disassembly and access to internal components for maintenance. This ensures the longevity and reliability of the valve by allowing for the convenient replacement of worn-out parts and routine inspections.
Pressure seal parallel gate valves are specifically engineered for high-pressure applications. They incorporate a pressure seal bonnet that provides a secure and leak-proof seal, even under extreme pressure conditions. These valves are widely used in industries such as power generation and oil and gas refining, where maintaining system integrity is critical.
Welded bonnet parallel gate valves are renowned for their exceptional strength and durability. The bonnet is directly welded to the valve body, creating a robust and leak-resistant seal. These valves are often preferred for heavy-duty applications requiring reliable performance and resistance to harsh operating conditions. They are typically available in smaller sizes.
Parallel Slide Gate Valve
Parallel Slide Gate valves present an elegant alternative to double disc valves, featuring two discs united by a single wedge rather than two. The discs maintain constant contact with the seat rings, achieving a tight seal through the horizontal Inconel spring interposition, without the assistance of a wedging mechanism.
The ACEV parallel slide valve design leverages the primary system pressure acting on the downstream disc to ensure seat integrity. It eliminates the need for wedging action or additional seat loading. This inherent design feature renders the parallel slide valve immune to thermal binding issues, offering a significant safety advantage in high-temperature applications.
ACEV parallel slide valves excel in high-pressure and temperature environments, finding widespread use in steam generation, petroleum, and natural gas industries. These valves come in various configurations—bolted bonnet, pressure seal, and welded bonnet—each tailored to specific use cases.
Distinct from traditional wedge gate valves, parallel slide valves employ two gates or discs that slide parallel to each other to regulate flow. Their superior sealing capabilities not only prevent contamination but also safeguard the system's integrity.
Through Couduit Slab Gate Valve
ACEV Slab Gate Valves, also known as "Through Conduit Gate Valves," are crafted and verified in adherence to the API 6D standard. These valves are indispensable in transportation pipelines for gases, crude oil, and oil products. When fully open, they allow pigging and generate a pressure drop equivalent to the connecting pipe's inside diameter. Designed meticulously to minimize pressure drop and trap foreign materials like slurries within the disc cavity, they keep the sealing surfaces pristine.
API 6D categorizes this valve type as "Slab-Gate," although it is sometimes referred to as "Parallel Disc." The seat faces are shielded during both open and closed positions. The valve's body cavity bleeding feature enables tight shut-off monitoring, while body guides prevent overpressure on rings. The seat faces are crafted from materials such as ENP25V750, 13Cr, 316, CoCr-A (Stellite), Monel, or TCC.
Manufactured according to API 6D standards, these valves are specifically tailored for on-off services. They are resilient enough to endure all types of process fluids under high pressure and temperature conditions.
The valve's design incorporates a rising stem that facilitates the gate's upward and downward movements, enabling it to open and close under line pressure. During normal operation, line fluid fills the cavity, and the gate is lifted by the flow path's generated pressure, assisted by the actuator spring, resulting in a fail-open configuration.
Expanding Gate Valve
The Double Expanding Gate Valve boasts a two-segment gate, each meticulously crafted with a dual-slope design—a male and a female—ensuring expansion in both open and closed positions. When the valve is shut, the gate offers a robust double barrier. With the valve open, a full-bore conduit is isolated from the cavity. The stem's thrust causes the gate to expand, achieving a perfect seal across the seats through this expansion. A cam mechanism cleverly prevents gate expansion during the stroke, allowing it to glide effortlessly, thereby minimizing seat and gate wear.
Equipped with a two-piece plate, the expanding gate is designed for optimal sealing expansion. In the closed position, it acts as a formidable double barrier. The stem's thrust triggers gate expansion, ensuring a tight seal across the seats.
Regardless of being open or closed, the expansion creates an impenetrable seal against both upstream and downstream seats. During the valve stroke, this innovative design effectively resists gate expansion, enabling smooth sliding and minimizing wear. The valve remains fully piggable in the open position, maintaining a pressure drop equivalent to the connecting pipe's inside diameter. Material choices are fully customizable to cater to our clients' project specifications.
Specifications:
·Size Range: 2" to 24" (DN15 to DN600)
·Pressure Class: ASME CLASS 150 to 600 (PN16 to PN110)
·Temperature Capability: -196°C to 816°C (-320°F to 1500°F)
Construction Highlights:
·The expanding gate ensures a secure mechanical seal.
·Double block and bleed functionality.
·Seals effectively at both low and high line pressures.
·Seat faces are positioned outside the flow stream in fully open or closed positions, extending seal life.
·Emergency sealant injection fittings available.
·Dual seal secures bonnet to body and yoke tube to bonnet connections.
·Standard thermal relief with an optional by-pass system for fugitive emission control.
·End connections include flanged (RF, FF, RTJ, etc.) and butt-weld.
·Operation via handwheel, gear, or actuator (pneumatic, electric, hydraulic).
·Body materials such as Monel, Inconel, Hastelloy, Incoloy, Duplex and Super Duplex, Carbon Steel, Low Temp Carbon Steel, Low Alloy Steel, Stainless Steel, and Titanium.
Applicable Standards:
·Design: API 6D, ISO 14313, ASME B16.34
·Flanged Ends: ASME B16.5
·Butt Weld Ends: ASME B16.25
·Face to Face: ASME B16.10, EN558, JIS B2002, MSS SP72
·Pressure-Temperature Ratings: ASME B16.34
·Mounting Pad: ISO 5211
·Inspection & Testing: API 598, EN12266, MSS SP82, ISO 5208
·Fugitive Emission: ISO 15848, API 624, API 641
·Firesafe: API 607, API 6FA, ISO10497
Optional Features:
·Extensive trim options.
·Stem and sealant injection extensions for underground service.
·Locking devices.
·Comprehensive testing and verification procedures.
·Zero emission secondary stem seals.
