High Pressure Needle Valves and Manifolds

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Brief Description

High Pressure Needle Valves and Manifolds are essential accessories used to isolate, equalize, and regulate the flow of process media to pressure instruments, particularly in high-static pressure or differential pressure applications.

In-depth Overview

Needle valves offer precise, gradual flow control and reliable shutoff, commonly used as instrument root valves. Manifolds (typically 2-valve, 3-valve, or 5-valve) combine multiple needle valves into a single body. 3-valve manifolds are mandatory for differential pressure (DP) transmitters, allowing for safe isolation and zero-checking (PHigh=PLow) without shutting down the process. They are built from high-strength forged stainless steel to safely handle extreme pressures and temperatures.

Specification

Parameter	Details
Valve Types	Needle Valve, 2-Valve, 3-Valve, 5-Valve Manifold
Max Pressure Rating	Up to 10,000 psi (690 bar) or higher (depending on material)
Body Material	Forged Stainless Steel 316, Carbon Steel
Stem Tip	Hardened 17−4PH SS or PTFE packing
Connection Types	Pipe Threads (NPT), Flange, Direct Mount
Mounting	Pipe or Transmitter Mounting (for manifolds)
Seat Design	Metal-to-Metal or Soft Seat (for bubble-tight shutoff)
Operating Temperature	−54∘C to 538∘C (depending on packing)

Applications

DP Flow Measurement: Used with orifice plates to ensure safe isolation and equalization of the DP transmitter.
Instrument Isolation: Providing a robust shutoff point for pressure gauges and transmitters connected to high-pressure headers.
Sampling Systems: Used to precisely regulate the flow of media for laboratory analysis.
Vent and Drain Lines: Providing precise control points for bleeding pressure or draining condensation.

Key Advantages

Enhanced Safety: Allows technicians to isolate instruments from high-pressure lines before maintenance or calibration.
Precise Control: The needle stem design provides superior flow regulation compared to ball or globe valves.
Simplified Maintenance: Manifolds integrate necessary functions (block, equalize, vent) into one compact unit.
High Integrity Sealing: Designed for zero leakage at maximum rated working pressure.

Payment and Shipping

We accept secure international payments including T/T and L/C. Valve and manifold sets are often customized by connection type and material; typical lead times are 3-5 weeks. We ensure all valves are capped, sealed, and packaged in heavy-duty cartons to protect the precision threads and stem mechanisms during shipping.

Frequently Asked Questions

Q: Why is a 3-valve manifold necessary for a DP transmitter?
A: The 3-valve manifold has two block valves to isolate the PHigh and PLow sides, and one central equalize valve. This allows the technician to safely equalize the pressure before opening the block valves or removing the instrument, protecting the sensor from sudden overpressure shock.

Q: What is the benefit of a direct-mount manifold?
A: A direct-mount manifold bolts directly to the transmitter's process ports, eliminating the need for pipe nipples and reducing potential leak points, resulting in a cleaner and safer installation.

Q: What is the temperature rating limitation of needle valves?
A: The temperature limit is usually set by the packing material around the stem. PTFE packing limits temperature, while high-temperature graphite or metal packing allows operation above 500∘C.

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High Pressure Needle Valves and Manifolds Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.