Instrumentation Valves, Fittings & Regulators

R-LOK covers the small-bore fluid systems between a process line and an instrument: fittings, valves, regulators, filters, quick connectors and hose assemblies. CHANGSHA RUNDA HITECH CO., LTD. has supplied this range since 2006 to oil and gas, petrochemical, semiconductor, new energy and pharmaceutical projects across the Middle East, Central Asia, Southeast Asia and Africa.

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Key features

Tube fittings 1/16 in to 1 in (1.6 mm to 25.4 mm) in 316/316L.
Valves rated up to 6,000 psi (413 bar), by size and seat.
Double-ferrule, threaded adapter and high-purity weld fitting families.
Needle, ball, gauge, manifold, check, plug, purge, bleed, UHP diaphragm valves.
PTFE standard seats; PEEK seats for higher temperature and wear resistance.
NPT per ASME B1.20.1 and ISO 228 parallel threads on request.

Specifications

Parameter	Value
Product families	tube fittings; instrumentation and high-purity valves; fluid control and hose accessories
Body material	316 or 316L stainless steel; 316L for high-purity and pharmaceutical duty
Tube size range	1/16 in to 1 in (1.6 mm to 25.4 mm), fractional and metric
Pipe threads	1/8 in to 1 in NPT; ISO/BSPP on request
Working pressure	up to 6,000 psi (413 bar), by size, body style and seat
Temperature	up to 450 °F (232 °C), depending on seat and seal
Fitting types	double-ferrule compression, threaded adapter, high-purity weld
Documentation	material certificate and dimensional inspection report available per shipment

What the range covers

The catalogue has three families. Fittings include double-ferrule compression, threaded adapters and high-purity weld types. Valves cover needle, ball, gauge, manifold, check, plug, purge, bleed, safety/relief and UHP diaphragm. Accessories cover pressure regulators, filters, quick connectors and hose assemblies.

Every family shares one design language: 316 or 316L stainless steel wetted parts, machined seats and stems, and end connections in NPT, ISO/BSPP or welded tube ends. A buyer can source the whole instrument hook-up from one supplier and one set of documents.

Choosing the right family

Start with the fluid and pressure. Clean, dry instrument air and nitrogen go through double-ferrule tube fittings. Higher-pressure hydraulic and process impulse lines need needle or manifold valves with metal or PEEK seats. Aggressive or high-purity media suit 316L bodies with PTFE or PEEK seats.

Confirm the connection and thread standard: NPT, ISO/BSPP or tube end. Mixed threads are the leading source of rework on small-bore panels. Send the port list, state what is replaced in service: a regulator, a 2-valve or 5-valve manifold, a quick connector or hose assembly.

Materials, ratings and documents

Bodies and wetted parts are 316 or 316L stainless steel, with 316L where high-purity or pharmaceutical duty applies. Seats and seals are PTFE as standard, PEEK for higher temperature. Pressure ratings follow ASME B31.3 practice and vary with size, body style, seat and temperature.

Threads follow ASME B1.20.1 for NPT and ISO 228 for parallel. Fitting dimensions and pressure data are quoted from the supplier catalogue, and the applicable figures are stated on the quotation and packing list. Orders are quoted item by item.

Standards referenced: NPT threads per ASME B1.20.1; Parallel threads per ISO 228; Pressure ratings per ASME B31.3 practice.

Typical duties: Oil and gas wellhead and instrument hook-up; Petrochemical and refinery impulse and sampling lines; Semiconductor and high-purity gas distribution; New energy plants: hydrogen, lithium and solar skids; Pharmaceutical and biotech clean utilities; Analyser and transmitter isolation and venting.

See also: Fluid Control Accessories · Tube Fittings · Valves

Frequently asked questions

What is the minimum order quantity and lead time?

No fixed minimum applies. Trial and mixed orders across the three families are consolidated into one shipment. Built-to-order items take a minimum set by the components used in our quotation. Standard items ship in a short lead time once order and payment terms are confirmed.

Which documents and packing come with the order?

The packing list, commercial invoice and, on request, the material certificate for the heat used and a dimensional inspection report. Third-party inspection, test reports and customer marking are arranged on request and confirmed at quotation.

Can you supply NPT and BSPP threads?

Yes. NPT threads follow ASME B1.20.1 and parallel threads follow ISO 228. The two are not interchangeable, so send the port list with the thread standard for each connection.

Request a quote or technical clarification

Send us the model, size, material and quantity you need — or a photo of the existing part. We reply with a quotation, availability and the applicable documents, usually within one working day.

Email nimo@runda-hitech.com

WhatsApp +86 136 5741 6007

Tel / WhatsApp: +86 136 5741 6007 · Email: nimo@runda-hitech.com