Threaded Needle Valve Models: J11 / J13 / J14 / J23 / J21 / J24 A threaded needle valve is a needle valve that uses threaded connections, generally available as female-threaded, male-threaded, female/male-threaded, or male-threaded with a welded tube. It is a common shut-off and regulating component in instrument piping systems. The valve body is typically forged from stainless steel (304/316L) or carbon steel. The internal key component is the conical (needle-shaped) tip at the end of the valve stem. By rotating the handle, the valve stem moves linearly, controlling the annular gap between the conical tip and the valve seat, thereby achieving precise shut-off or micro-flow regulation of the medium. Common end connection threads include NPT (National Pipe Thread), PT (British Standard Pipe Taper), or G (British Standard Pipe Parallel). According to the flow path configuration, threaded needle valves can be divided into straight-through type (inlet and outlet coaxial) and angle type (inlet and outlet perpendicular) to accommodate different installation spaces and piping layouts. The threaded needle valves produced by Kaivex Valve Group are compact and lightweight. They offer good sealing performance and are especially suitable for high-pressure (up to 6000 psi) low-flow applications. The conical sealing design provides extremely high shut-off sealing capability. However, it should be noted that they are not suitable for high-viscosity fluids or media containing solid particles.

Welded Needle Valve Models: J21 / J23 / J24 / J26 / J61 A welded needle valve is a needle valve that uses welded connections. The main welding types include butt weld, socket weld, and welded tube. Its greatest feature is leak-free connection. Compared with threaded connections, the welded end (socket weld or butt weld) achieves permanent metal fusion between the valve body and the pipe, eliminating dynamic sealing points and completely preventing external leakage of the medium. This makes it especially suitable for harsh conditions such as flammable, explosive, highly toxic, or high-vacuum applications. In terms of core function, it is the same as ordinary needle valves, relying on the precise fit between the conical tip at the end of the valve stem and the valve seat to achieve high-precision shut-off or flow regulation of the medium. In structural design, to cope with high temperature and high pressure, hard seals (metal-to-metal) and high-temperature flexible graphite packing are often used. When selecting a valve, it is necessary to specify whether the connection is socket weld or butt weld, as well as the specific wall thickness schedule of the pipe. The welded needle valves produced by Kaivex Valve Group are an irreplaceable solution in power plants, chemical plants, core oil refining units, and high-temperature hot oil systems in the nuclear industry.

Pressure Gauge and Flanged Needle Valve Models: GMJ11F / J19W / J29W / JJM1 / J41W / J44W / J91W A pressure gauge needle valve is a small needle-type shut-off valve used in instrument piping systems. Its core function is to connect, shut off, or regulate the flow of media between a pressure gauge and the process pipeline. It is commonly used as an instrument root valve, drain valve, or sampling valve. Its name comes from the internal key component—the conical (needle-shaped) tip at the end of the valve stem. The valve body is typically forged from stainless steel (304/316) or carbon steel. The bottom of the valve stem is machined into a conical shape and precisely mates with the conical sealing surface on the valve seat. By rotating the handle, the valve stem moves linearly back and forth, controlling the annular gap between the conical tip and the valve seat, thereby achieving a wide range of flow control from fully closed, to micro-fine regulation, to fully open. The needle valves produced by Kaivex Valve Group are compact in structure and suitable for high-pressure (up to 6000 psi or even higher), high-temperature, or corrosive media environments. Because they can achieve extremely small and stable flow output, they are particularly suitable for overload protection and smooth pressure tapping in front of sensitive instruments such as pressure gauges, differential pressure transmitters, and level gauges. They are widely used in instrument tubing and valve assemblies in industries such as petroleum, chemical, electric power, and gas stations.

Needle Valve and Distributor Models: J41 / J44 / KFQ Needle valves and distributors are two key components with complementary functions in instrument piping systems. A needle valve, as previously described, is a precision shut-off valve. It relies on the precise fit between the conical needle tip at the end of the valve stem and the valve seat to achieve fine flow regulation or forced shut-off of the medium. Its core features are good sealing performance, high pressure resistance, and suitability for high-pressure, low-flow applications such as instrument sampling, draining, and pressure buffering. However, due to its narrow flow path, it is not suitable for high-viscosity fluids or media containing solid particles. A distributor is a manifold component used to evenly distribute a single fluid medium into multiple output paths. Structurally, it typically consists of one inlet main port and multiple outlet branch ports, commonly in the form of a block-type body or tube-type connection. Distributors may have integrated shut-off valves or needle valves to allow independent on/off control of each branch. Their main functions are to simplify piping layout, reduce potential leak points, and ensure relative balance of pressure or flow across the branches. Application Relationship: In instrument systems, needle valves are often installed directly on each outlet branch of a distributor to independently regulate and control multiple instruments (such as pressure gauges or transmitters) or sampling points. Together, they form a compact and efficient fluid distribution and regulation unit, widely used in analyzer cabinets, instrument panels, and heat tracing systems in industries such as petroleum, chemical, and pharmaceuticals.

Needle Valve Manifold and Instrument Manifold Models: 1151 / EF-2 / 1151T / SS-M2F8 / J23SA / QFF3 / WF-3 / WF-1 / WF-2 / SS-M5F8 / SF-2B / QFF3 / QF-05 / 3051 A needle valve manifold (instrument manifold) is a combined valve assembly that integrates multiple shut-off valves or pressure tapping valves into a single unit, specifically designed for use with field instruments such as differential pressure transmitters and pressure transmitters. Its core functions include pressure transmission, connection, shut-off, balancing, and venting/draining between the instrument and the process pipeline. The manifold typically consists of two, three, or five individual valves (e.g., high-pressure valve, low-pressure valve, balancing valve, drain valve) integrated into a single valve body with precision-engineered internal flow paths. Common types include two-valve manifolds, three-valve manifolds, and five-valve manifolds:Two-valve manifold: Consists of two shut-off valves (high-pressure side and low-pressure side) and is used for simple pressure measurement.Three-valve manifold: Adds a balancing valve to the two-valve design. It is used for installation, zero adjustment, or removal of differential pressure transmitters, effectively preventing sensor damage due to single-side overpressure.Five-valve manifold: Adds two drain/test valves to the three-valve design, offering more comprehensive functionality for draining, flushing, and calibration.Compared with traditional discrete single valves, manifolds greatly simplify piping connections and reduce potential leak points. They are compact, occupy less space, and offer good rigidity and vibration resistance. The valve body is typically made of stainless steel (304/316L), and sealing options include PTFE or graphite. The needle valve manifolds produced by Kaivex Valve Group are widely used in industries such as petroleum, chemical, electric power, and metallurgy, and are installed directly between the transmitter and the flange or impulse line.