SUPERIOR FLUID SOLUTIONS · VALVE CROSS-REFERENCE
Cross-Referencing a Parker® Needle Valve
What has to match between the part on the drawing, the valve in your hand and the one you order.
A Parker® needle valve on a drawing, or a failed one on your bench, gives you a part number and very little else. Cross-referencing it means matching by form, fit and function, and that starts with reading what the number encodes. According to Parker®’s own Needle Valves Catalog 4110-NV, a manufacturer publication, a code such as 4Z-V4AK-SS describes an angle pattern V4 Series valve with 1/4 in. compression ends, and the code carries the connection size and type, series and flow pattern, stem type, stem seal and body material. Our needle valves page covers the range we list. This post covers the matching.
Start with the end connections
Parker® lists V Series ports from 1/8 in. to 3/4 in. (3 mm to 12 mm), in inline and angle patterns, and its ends include compression and NPT, male and female. Do not stop at the size. A 1/4 in. compression end takes tube with a 1/4 in. outside diameter. A 1/4 in. female NPT end is a pipe thread, and the two are different things. The catalog shows both on its 1/4 in. valves, so read the code, then measure the ends on the failed valve before you trust the drawing.
Flow pattern belongs here too. Inline and angle valves of the same series carry different flow figures, and an angle body will not drop into an inline run without re-piping.
Orifice and Cv set the flow
The catalog gives the V Series an orifice from 0.078 in. to 0.312 in. and a Cv from 0.12 to 1.90. Within that spread, two 1/4 in. valves can behave differently. The V4 with 1/4 in. compression ends has a 0.176 in. orifice, with a blunt-stem Cv of 0.43 inline and 0.55 angle. The V6 with 1/4 in. female NPT has a 0.228 in. orifice, with a blunt-stem Cv of 0.73 inline and 1.23 angle. Parker® notes its flow data was tested to ISA S75.02.
So an orifice and a Cv go on your cross-reference sheet next to the port size. If the original valve restricted flow on purpose, a larger orifice is a change to the system, not a detail.
Pressure and temperature: the weakest part governs
For the V Series, Parker® rates 316 stainless steel at 5,000 psig and brass or Monel® alloy 400 at 3,000 psig, with a temperature range of -65 °F to 450 °F for stainless steel and Monel® alloy 400 and 400 °F for brass. A PCTFE stem tip is limited to 350 °F. The catalog says the most restrictive rating becomes the limiting factor when materials are combined, and that the actual pressure rating depends on valve configuration, body material and seat material. Read the rating off the exact part, not the series name.
| Item | What the catalog publishes | Check on the swap |
|---|---|---|
| End connection | Compression, NPT male, NPT female, 1/8 to 3/4 in. | Tube OD or thread, and size |
| Orifice, Cv | 0.078 to 0.312 in., 0.12 to 1.90 (V Series) | Both values for the same pattern |
| Pressure | 5,000 psig in 316; 3,000 psig in brass or Monel® | Rating of the exact configuration |
| Temperature | -65 to 450 °F; PCTFE tip to 350 °F | Lowest limit in the assembly |
| Stem | R blunt, N tapered needle, K PCTFE tip | Tip style and tip material |
| Packing | PTFE packing or elastomeric O-ring seals | Seal material against the media |
| Bonnet | Integral (V); union (U), 6,000 psig | Bonnet style and rating |
Figures are Parker®’s published catalog values. They describe Parker® products only.
Stem, packing, bonnet and body
The R stem is all metal with a blunt tip, the N stem is all metal with a tapered needle tip, and the K stem has a PCTFE tip. Packing is PTFE or elastomeric O-ring stem seals. The V Series has an integral bonnet. The U Series has a union bonnet, a 6,000 psig rating, and its catalog lists PTFE packing to 450 °F and Grafoil® packing to 700 °F. Body material is the last check. The catalog offers 316 stainless steel, brass and Monel® alloy 400, and a corrosion-resistant 316 stainless steel body is the first thing to confirm when the media is aggressive. Where the drawing is silent on grade, our material test report post covers the paperwork that records it.
From the Parker® part to a Superlok® shortlist
Once the values above are written down, the shortlist is a comparison of numbers, not of names. Superlok North America lists four needle valve series: SINV at 3000 to 5000 psi, SBNV at 6000 psi, SHBNV bar stock at 10000 psi and SUNV union bonnet at 6000 psi. The line also carries the claim we repeat to buyers, the finest interior surface finish of any tube and pipe fitting on the market. Our needle valve shop shows what is listed in 316 stainless steel.
For the manufacturer side of the question, see our note on needle valve manufacturers. If the drawing mixes metric and inch dimensions, ordering metric tube fittings from an imperial drawing covers the trap.
Questions on a Parker® needle valve cross-reference
Can you quote from the Parker® part number alone?
We can start from it. The number tells us the series, ends, pattern, stem and body. We still compare orifice, ratings and packing against the application before anything is confirmed per order.
The valve has no markings. What do you need?
The measured end connections, flow pattern, handle style, media, working pressure and temperature. Send them through the quote form and we work from those.
Does a different stem tip matter?
Yes. A tapered needle tip, a blunt tip and a PCTFE tip are different parts, and the PCTFE tip carries a lower temperature limit in the Parker® catalog.
Is brass acceptable if the original was stainless steel?
Only if the media and ratings allow it. In the V Series, brass is rated lower in pressure and temperature than 316, so the swap can fall below your operating point.
Have the Parker® part number in hand?
Send the code and your operating pressure and temperature, and we will work through the match with you.
SUPERIOR FLUID SOLUTIONS
Read the number, check the values, confirm the order.
Sources
- Parker® Hannifin Instrumentation Products Division, “Needle Valves Catalog 4110-NV,” listed as June 2019. Supports the V and U Series ports, orifice, Cv, pressure, temperature, stem, packing, bonnet and part number construction figures. parker.com
- Superlok North America, “Needle Valves” product page. Supports the four needle valve series and their pressure ratings. superloknorthamerica.com
Technical note: The Parker® catalog establishes what Parker® publishes for its V and U Series needle valves. It does not establish how any other maker’s valve performs, and the Superlok North America page lists series and pressure ratings only. Data on a given valve may differ by configuration, so grade and rating are confirmed per order.
Trademark disclaimer: Parker®, Monel® and Grafoil® are registered marks of their respective owners. Superlok® is a registered mark of its owner. Their use here identifies the products referenced. Cross-references are made by form, fit, and function only.
