Nuclear-grade single gate valve, Single gate valve, Gate valve

Product Details

Bore range: 2" - 30" (DN50 - DN750) 

Pressure level: 150lb - 2500lb 

Design standard: RCC-M, ASME-Ⅲ 

Main materials: carbon steel, alloy steel, stainless steel, etc. 

Connection method: Flange connection, butt welding, etc. 

Operation mode: Manual, Electric, Pneumatic, etc.

The nuclear-grade single gate valve is a cutting device specially designed for the nuclear island and nuclear safety systems of nuclear power plants. It adopts a single wedge-shaped or parallel gate plate structure, meeting the nuclear safety level 2/3 standards, featuring resistance to radiation, thermal shock, and zero leakage. It is used for the full opening and full closing control of key media such as reactor coolant.

Single gate plate structure: Composed of a single integral metal gate plate (rigid or elastic), without an intermediate opening mechanism; when closed, the gate plate is楔ed into the gap between the two valve seats to achieve sealing by relying on the valve stem thrust.

Single gate plate structure: Composed of a single integral metal gate plate (rigid or elastic), without an intermediate opening mechanism; when closed, the gate plate is楔ed into the gap between the two valve seats to achieve sealing by relying on the valve stem thrust.

Sealing mechanism: Mostly of forced sealing (wedge type relying on angular interference) or elastic compensation sealing (the elastic single gate plate with an annular groove can adjust the fit degree); the sealing surface is usually welded with hard alloys such as Stellite to resist erosion and corrosion.

Sealing mechanism： Mostly of forced sealing (wedge type relying on angular interference) or elastic compensation sealing (the elastic single gate plate with an annular groove can adjust the fit degree)； the sealing surface is usually welded with hard alloys such as Stellite to resist erosion and corrosion.

Anti-leak design: The valve stem packing box usually adopts a structure of double-layer packing + disc spring pre-tightening + leakage pipe to prevent the leakage of radioactive media.

Anti-leak design： The valve stem packing box usually adopts a structure of double-layer packing + disc spring pre-tightening + leakage pipe to prevent the leakage of radioactive media.

Action logic： When fully open， the flow resistance is extremely small (straight-through flow channel)； when fully closed， it blocks the flow； in the semi-open state， it is prone to cause erosion and damage to the sealing surface， so the flow rate adjustment is prohibited.Action logic： When fully open， the flow resistance is extremely small (straight-through flow channel)； when fully closed， it blocks the flow； in the semi-open state， it is prone to cause erosion and damage to the sealing surface， so the flow rate adjustment is prohibited.

Application fields

Reactor coolant system (primary loop): As the main circuit isolation valve, it withstands high-temperature and high-pressure borated water medium and must meet the nuclear safety level 1 seismic and LOCA accident conditions requirements.

Main steam and feedwater system: Used for cutting off steam pipelines in the conventional island and nuclear island, it can withstand high-temperature steam (≤350℃~550℃) and high-pressure impact.

Safety shell isolation system: Quickly closed in accident conditions to prevent the leakage of radioactive substances, and it needs to pass strict airtightness and seismic tests.

Emergency cooling and makeup water system: Configured on high-pressure/low-pressure makeup water pipelines, ensuring reliable cutting or conducting of coolant in emergency situations.

Chemical volume control and waste treatment system: Used for isolating radioactive liquid transportation pipelines, requiring resistance to irradiation and zero-leakage sealing.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 470 gallon liquid totes Special package is available on request. E FORUs’  is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition