DZ41W Cryogenic Gate Valve Overview

The DZ41W Cryogenic Gate Valve is a high-performance gate valve specifically designed for ultra-low temperature media such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid hydrogen, liquid ammonia, and liquid ethylene. It features a flanged connection.The valve body and key components are manufactured from low-temperature resistant stainless steel (such as CF8, F304) or low-temperature alloy steel (such as LCB, LC3). These components undergo deep cryogenic treatment to eliminate residual stresses, ensuring excellent low-temperature toughness and dimensional stability at temperatures as low as -196°C.The gate valve operates by lifting and lowering the gate to open or close, making it suitable for fully open or fully closed shut-off applications. The bonnet length is determined based on the operating temperature, utilizing an extended bonnet design. This positions the stuffing box away from the cold zone, preventing the packing from freezing and mitigating valve stem seizure.This valve is widely used in LNG terminals, air separation units, petrochemical low-temperature installations, and energy systems.

DZ41W Cryogenic Gate Valve Product Image

DZ41W Cryogenic Gate Valve Features

1.  Extended Bonnet Anti-Freezing Design: The bonnet length is determined based on the valve's operating temperature, effectively lengthening the path for cold conduction. This ensures the stuffing box remains in a higher temperature zone, preventing the packing from freezing and the valve stem from seizing, guaranteeing flexible and reliable operation.

2.  Cryogenic Treatment and Low-Temperature Materials: Key components are manufactured from low-temperature resistant stainless steel or low-temperature alloy steel. The chemical composition and mechanical properties such as low-temperature impact toughness are strictly controlled. Components undergo deep cryogenic treatment to relieve stress, ensuring material stability at -196°C.

3.  Cavity Pressure Relief Safety Structure: To prevent abnormal pressure rise in the valve cavity, a pressure relief hole is provided on the inlet side of the gate. This effectively avoids the risk of body damage caused by medium vaporization and expansion, enhancing valve safety.

4.  Low Fluid Resistance and Wide Applicability: The medium flow direction is unrestricted, with no flow disturbance or pressure drop, resulting in low fluid resistance and minimal erosion of the sealing surfaces. It is suitable for a wide range of cryogenic media, including methane, ethane, propane, liquid ammonia, liquid oxygen, liquid nitrogen, and liquefied natural gas.

5.  Multiple Sealing Surface and Flange Standards: Materials for components such as packing and gaskets (e.g., flexible graphite, PTFE, cryogenic asbestos) are selected based on the operating temperature. Various piping flange standards and sealing face types are available to meet diverse engineering requirements.