Through Conduit Double Expanding Gate Valve
PCV through conduit double expanding gate valve is a developed version of the slab gate valve indeed, and Instead of one “slab,” the disc of this type will be equipped with a two-segment disk with a matching double slope shaped interface.These slopes faces are made to cause the expansion of the gate in both open and closed position to play his rule for opening or closing the valve. The two halves of the gate are interlinked and engaged so that they move apart when they are being slid into the fully open or fully closed positions. Still, they are free of friction in the intermediate position during the disc stroke to avoid wearing of sealing surfaces.
Double expanding valves and its distinctive wedge mechanism provides tight seal and isolation on both upstream and downstream seating surfaces even at low-pressure levels.
The specific design of this type of valve guarantees to function as bi-directional as well as the slab gate type. Pigs and scrapers required for testing and cleaning of Pipelines can be run through this type of valve without any damage to the valve and equipment.
PCV Through Conduit Double Expanding Gate Valve also provides a double block and bleed (DBB) feature. It is functionality achieved within one single valve assembly, as opposed to the two conventional slab gates that would otherwise be required.
Valve Acting Basic
PCV Through Conduit Gate Valves are designed and manufactured with the rising-stem to provide the floating movement of the gate. While the valve is under Service, the service fluid will fill the bore cavity. The fluid pressure in the bore cavity makes a vertical force to the Stem that pushes the trim from bottom to top, then, in case of emergency, this force will be used to assist the actuator spring to bring the valve’s gate to the specified failure mode position
Standard Acting type
In the valve that is designed as Standard acting Through Conduit Gate, while the Stem/gate downwards the valve will be closed, and it is common for fail to open configuration, as the force of fluid to Stem and trim assists the actuator to open the valve.
Reverse Acting type
In the valve that is designed as Reverse Acting Through Conduit Gate, while the Stem/gate upwards, the valve will be opened, and it is common for the fail to close configuration, As the force of fluid to Stem and trim assists the actuator to close the valve.
design and specific features
- Designing
- API6D
- API6A
- ASME B16.34
- Soft and Metal Seat
- Full Bore Port, No Erosion in Seat Surface due to fluid
- Anti-Blow Out Stem
- Anti-Static
- Fire Safe Design
- Bi-directional and Uni-Directional Feature
- Main Construction as:
- Standard Action
- Reverse Action
- Self-Relieving feature
- Suitable for Scrapper and Pigging
- Back Seat
- Double Block and Bless (As per Request)
- Tight Sealing in Both Seat Direction
- Extended Bonnet and Stem for Special Service (As per Request)
- Low-Pressure Drop
- Full Hard Facing/Coating for Disk surfaces
- Sealant Injection for Seat rings and Stem
- The ISO 5210 mounting pad provides to facilitate convenient actuator installation.
Valve Additional Ports:
- Vent and Drain as Plug and Flanged: Venting Valve provides to avoid overpressure inside the body-bonnet cavity. The drain port is to release the residue within the body cavity.
- Lines with valves (Upon request): Check and Glob Valves
- Injection Sealant Port: Emergency sealant injection is considered to prevent leakage in case of a seating stem and seal’s failure.
Size | Pressure Class | End Connection:
- Pressure Class: 150# to 1500#
- Size: 2” to 48”
- Ending Flanges as per ASME B16.5 and B16.47
- Butt Welding Ends : ASME B16.25
Material Selection
Body
Bonnet
Disc
Seat Ring
Low temp. Carbon Steel
Low Alloy Steel
Austenitic Stainless Steel
Duplex, Super Duplex, Hastelloy
NACE Material
Sealing Surface of Seat Ring & Disk
HVOF for different grade of coating
Tungsten/Chromium carbide coating
Soft Seat
for Slab gate
PRPTFE
PCTFE
PEEK
DEVLON
NYLON