Instrumentation Valves & Manifolds Manufacturer for EPC, Power Plant & Process Control

✅ Professional Instrumentation Valves & Manifolds Manufacturer in China
We are a professional manufacturer of instrumentation valves and manifolds for EPC projects, power plants, petrochemical, oil & gas, water treatment, and process control systems. Instrumentation valves are small-bore valves used to isolate, regulate, or vent process media connected to gauges, transmitters, and sampling systems. An instrumentation manifold combines multiple valve functions — block, bleed, and equalize — into a single compact unit, reducing leak points and simplifying maintenance. Our product portfolio includes needle valves, instrument ball valves, 2-valve manifolds, 3-valve manifolds, and 5-valve manifolds, manufactured in 316 stainless steel with optional Hastelloy and Monel. All products comply with ASME B16.11, MSS SP-99, MSS SP-105, and ASME B16.34, available in pressure ratings up to 6000 psi (41.4 MPa) and temperature ratings up to 540°C (1000°F).

📋 Product Overview & Key Features

Instrumentation valves and manifolds are the critical interface between the process and measurement instruments. They must provide bubble-tight isolation, enable safe venting and calibration, and withstand the pressure, temperature, and corrosion of the process. Our products are manufactured from bar stock or forgings, with AISI 316 stainless steel as the standard material and NACE MR0175 construction available for sour service. Key features include:

📦 Instrumentation Valve Types

📦 Manifold Configurations & Applications

* 2-valve manifolds isolate and vent a single pressure source; 3- and 5-valve manifolds allow isolation and equalization of both high and low sides of a DP transmitter.

📋 Technical Specification

* Custom materials, pressure ratings, and connection configurations are available upon request for EPC project tenders.

📊 Instrumentation Manifold Selection Guide

❓ Frequently Asked Questions (FAQ)

Q1: What are instrumentation valves and manifolds?
A: Instrumentation valves are small-bore valves used to isolate, regulate, or vent process media connected to gauges, transmitters, and sampling systems. An instrumentation manifold combines multiple valve functions — block, bleed, and equalize — into a single compact unit, reducing leak points and simplifying maintenance.

Q2: What are the main types of instrumentation valves?
A: The main types include: Needle valves — for isolation and fine throttling; Instrument ball valves — for quick quarter-turn shut-off; Bleed valves — for venting gas or liquid; and Manifold valves — integrating multiple functions into one body.

Q3: What standards do your instrumentation valves and manifolds comply with?
A: Our products comply with ASME B16.11 (forged steel fittings, socket weld and threaded), MSS SP-99 (instrument valves), MSS SP-105 (instrument manifolds), and ASME B16.34 (valves — flanged, threaded, and welding end).

Q4: What is the difference between a 2-valve, 3-valve, and 5-valve manifold?
A: A 2-valve manifold (one block + one bleed) is used for gauge pressure measurement to isolate and vent the transmitter. A 3-valve manifold (two block + one equalizer) is used for differential pressure measurement, allowing isolation of both high and low sides and equalization during calibration. A 5-valve manifold adds two vent valves for more thorough purging and calibration, typically used in gas service.

Q5: What is the difference between a needle valve and an instrument ball valve?
A: A needle valve provides fine flow control and throttling through a tapered stem and seat, with bubble-tight shut-off. An instrument ball valve provides quick quarter-turn shut-off with low torque and full bore, ideal for on/off isolation where fine control is not required.

Q6: What material are instrumentation manifolds typically made from?
A: The standard material is AISI 316 stainless steel, offering excellent corrosion resistance for most process applications. Hastelloy C-276, Monel, and Duplex 2205 are available for more aggressive media, and NACE MR0175 construction is available for sour service.

Q7: What is the pressure rating of your instrumentation valves?
A: Standard rating is 6000 psi (41.4 MPa) at ambient temperature. 10,000 psi (68.9 MPa) versions are available for higher pressure applications.

Q8: What is the temperature rating of your instrumentation valves?
A: With standard PTFE stem packing, the temperature limit is approximately 200°C. With graphite stem packing, operating temperatures up to 540°C (1000°F) are achievable.

Q9: What valve sizes are available?
A: Needle and ball valves are available in 1/4", 3/8", 1/2", 3/4", and 1" sizes. Manifolds are typically configured for 1/2" or 3/4" process connections.

Q10: What process connections are available?
A: Standard connections include NPT female, socket weld, and butt weld. Connection sizes range from 1/4" to 1" depending on the valve or manifold.

Q11: What is the difference between a coplanar and a conventional manifold?
A: A coplanar manifold is designed to mount directly to the flange face of a coplanar-style differential pressure transmitter, providing a compact, direct-mount solution with fewer connections. A conventional manifold is a separate unit connected between the process impulse lines and the transmitter, offering more flexibility in installation layout.

Q12: When should I use a 2-valve manifold instead of a 3-valve manifold?
A: Use a 2-valve manifold for gauge pressure (static pressure) measurement where only one pressure connection needs to be isolated and vented. Use a 3-valve manifold for differential pressure measurement where both high and low sides must be isolated and equalized for calibration.

Q13: What is a bleed valve used for?
A: A bleed valve is a compact valve with a small orifice that threads into a gauge valve or transmitter body. It is used for venting gas or liquid from the instrument for calibration or maintenance. Standard bleed valves do not have stem packing and should not be connected to pressurized lines.

Q14: Can instrumentation valves be used in sour service (H₂S)?
A: Yes. We offer NACE MR0175 construction with controlled material hardness for resistance to sulfide stress cracking in sour oil and gas service.

Q15: What is the function of the equalizer valve in a 3-valve manifold?
A: The equalizer valve connects the high and low sides of a differential pressure transmitter. When opened during calibration or zeroing, it equalizes the pressure on both sides so the transmitter can be zeroed without removing it from service.

Q16: How are instrumentation manifolds installed?
A: Manifolds are typically mounted directly to the instrument (transmitter or gauge) or to a mounting bracket/stand. The process impulse lines connect to the manifold inlets. The compact, integrated design reduces the number of tube connections and simplifies installation compared to discrete valves.

Q17: What certificates are provided with your instrumentation valves and manifolds?
A: Standard: EN 10204 3.1 mill certificates. Additional services: PMI (Positive Material Identification) , hardness testing, hydrostatic and gas testing, and full heat number traceability.

Q18: What are the typical applications of instrumentation valves and manifolds in EPC projects?
A: Power plants — steam and water pressure/level measurement; Petrochemical — process pressure and differential pressure measurement; Oil & gas — wellhead and pipeline instrumentation; Water treatment — pump and filter pressure monitoring; EPC projects — instrumentation and control systems.

Q19: Do you support EPC projects with technical documentation?
A: Yes. We provide datasheets, dimension drawings, material certificates, and full traceability documentation for EPC project compliance. Our engineering team can review your instrumentation specifications and recommend the optimal valve and manifold configuration.

Q20: Can you provide custom instrumentation valve and manifold configurations?
A: Yes. We offer custom materials, pressure ratings, connection types, manifold configurations (2/3/5-valve), and special dimensions to meet project-specific requirements. Our engineering team works closely with EPC contractors to develop solutions that match specific piping classes, instrument connections, and service conditions.