DZ41W Forged Stainless Steel Cryogenic Gate Valve Overview

The DZ41W Forged Stainless Steel Cryogenic Gate Valve is a high-performance gate valve specifically designed for cryogenic services, featuring a forged stainless steel body and a flanged connection. It is suitable for ultra-low temperature media such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid hydrogen, liquid ammonia, and liquid ethylene.The valve body and key components are manufactured from forged stainless steel materials such as F304 and F316L. These components undergo rigorous 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. The length of the extended bonnet is determined based on the operating temperature, positioning the stuffing box away from the cold zone. This design prevents the packing from freezing and mitigates valve stem seizure.This valve is widely used in LNG terminals, air separation units, petrochemical low-temperature installations, and energy systems. It is a critical piece of equipment for achieving reliable shut-off under ultra-low temperature working conditions.

DZ41W Forged Stainless Steel Cryogenic Gate Valve Product Image

DZ41W Forged Stainless Steel Cryogenic Gate Valve Features

1.  High-Pressure Capability of Forged Stainless Steel: Constructed from forged stainless steel materials (F304/F316L), the valve features a uniform and dense structure with high mechanical strength. It can withstand higher working pressures (PN1.6-16.0MPa), making it suitable for high-pressure cryogenic applications.

2.  Deep Cryogenic Treatment Process: The chemical composition and mechanical properties such as low-temperature impact toughness are strictly controlled. Components undergo deep cryogenic treatment to relieve stress, ensuring low-temperature toughness and dimensional stability at -196°C, preventing brittle fracture and leakage due to deformation.

3.  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.

4.  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.

5.  Low Fluid Resistance and Wide Applicability: The medium flow direction is unrestricted, with no flow disturbance or pressure drop, resulting in low fluid resistance. The sealing surfaces are overlaid with hardfacing alloy (STL), providing resistance to wear and erosion. It is suitable for a wide range of cryogenic media, including methane, ethane, propane, liquid ammonia, liquid oxygen, liquid nitrogen, and liquefied natural gas.