High-Pressure Needle Valves

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High-Pressure Needle Valve Product Introduction

Definition of High-Pressure Needle Valve

A high-pressure needle valve is a precision control valve suitable for high-pressure fluid systems (e.g., hydraulic, petroleum, chemical industries). Its core function is to accurately regulate or shut off small flows of high-pressure media, featuring high temperature resistance, high pressure resistance, reliable sealing, and high flow control precision.

Working Principle of High-Pressure Needle Valve

Control is achieved through the precise cooperation of a needle-shaped valve core and a tapered valve seat. When the handwheel is rotated, the valve core moves along the axis, changing the gap with the valve seat: a larger gap increases media flow, while a smaller gap reduces flow; when the valve core is fully attached to the valve seat, the valve closes to block media circulation. The needle-shaped core enables fine adjustment of micro-flows, meeting the precise control needs of high-pressure working conditions.

Main Structure of High-Pressure Needle Valve

Component	Specification
Valve Body Material	316ss, 316L, Hastelloy, Monel alloy
Needle-Shaped Valve Core	Cemented carbide or stainless steel
Tapered Valve Seat	High sealing precision
Handwheel	Aluminum alloy or stainless steel
Sealing Element	PTFE or metal seal

Technical Parameters of High-Pressure Needle Valve

Parameter	Details
Nominal Diameter	DN1~DN50
Maximum Working Pressure	10000psi
Operating Temperature	-30℃～+200℃ (Standard Type), -40℃～+600℃ (High-Temperature Type)
Structure Type	Transmission thread is outside the packing, offering good high-temperature and pollution resistance
Stem Seal	Dual protection of packing seal and fluororubber O-ring seal
Valve Core Structure	Non-rotating valve core made of super-hard alloy, ensuring long service life
Valve Body Material (Wetted Part)	316L stainless steel
Packing Seal	Graphite-reinforced PTFE for standard type; graphite for high-temperature type
Applications	Suitable for high-temperature, high-pressure, and frequent on-off scenarios; applicable to corrosive gases and liquids compatible with the valve material

Selection Guide of High-Pressure Needle Valve

System Pressure: The selected rated pressure should be 1.2-1.5 times higher than the system working pressure to avoid damage due to overpressure
Medium Characteristics: Choose 316 stainless steel valve body for corrosive media, and metal seal structure for high-temperature media
Flow Requirement: Match the nominal diameter according to the actual flow range; prioritize DN1-DN10 models for small flows
Connection Method: Select threaded or flange connection based on pipeline design to ensure installation compatibility

Tag: Needle-Valves