FITOK NGSS-FL4-7-Y Panel Mount Needle Valve, 1/4 in. FITOK

NGSS-FL4-7-Y is a FITOK NG Series integral bonnet needle valve prepared for panel mounting, with 1/4 in. FITOK tube fitting ends. The product page lists 3,000 psig (207 bar) from -65 F to 450 F (-54 C to 232 C), a 0.16 in. (4.0 mm) orifice and Cv 0.35.

A needle valve that mounts through a panel

The Y at the end of the code is the catalog suffix for panel mounting. The valve body passes through a hole in the panel and a nut on the threaded neck locks it in place, so the operator turns the handle on the front while the tube connections stay behind the panel. This keeps process piping out of sight and reduces handling of the valve under operation.

NG means integral bonnet: the bonnet and body are one machined piece, which avoids a gasketed joint at the top. SS is 316 stainless steel, FL4 is a 1/4 in. FITOK tube end and 7 refers to the 0.16 in. orifice size that gives Cv 0.35.

Features given by the manufacturer

• Integral bonnet design with PTFE packing, working from -65 F to 450 F (-54 C to 232 C).
• 3,000 psig (207 bar) working pressure for this code.
• Panel mounting with a panel thickness range of 1/16 in. to 1/4 in.
• Regulating stem for fine adjustment of small flows.

Technical specification

Specification of NGSS-FL4-7-Y

Panel mount or line mount

Choose the panel version when the valve sits on a gauge board, sampling cabinet or analyzer shelter and the operator should not reach into the piping area. Choose a line-mounted valve when the valve is carried by the pipe itself. The same body size and ratings apply, but the panel version needs the cut-out dimensions listed above.

Needle valves regulate small flow rates; Cv 0.35 is low compared with ball valves. If the process needs quick full opening, a quarter-turn valve is a better fit. Where very small flows must be set precisely, the fine stem thread of a needle valve is the right choice.

The temperature limit depends on the packing. This code uses PTFE packing, so the lower limit of -65 F is available; the NG catalog lists other packings for higher temperatures, which would alter the code.

Mounting and use

Drill the panel to the cut-out size shown, insert the valve from the back, fit the panel nut on the front and tighten it. Then connect the tubes. Do not use the handle to hold the valve while tightening fittings.

Close the valve by hand only. Excess force with a wrench on the handle can damage the needle tip or seat, and a damaged tip no longer seals.

Use in GCC plants

General engineering note: panel needle valves are common on pressure gauge boards, instrument air supplies, analyzer sample conditioning panels and test benches in refineries, power plants and desalination stations. Stainless steel fittings and valves are favored near the coast where humidity and salt are high. Check process compatibility before ordering.

Related items

The NU union bonnet needle valve, ball valves and check valves in the FITOK range can be supplied together with this code, along with 316 stainless steel tubing and fittings for the panel connections.

Frequently asked questions

What does the Y mean in NGSS-FL4-7-Y?

Y is the catalog suffix for the panel mount version of the NG series needle valve.

What panel thickness can be used?

The catalog lists panels from 1/16 in. to 1/4 in. thick.

What is the working pressure and temperature?

3,000 psig (207 bar) from -65 F to 450 F (-54 C to 232 C) with PTFE packing.

What does integral bonnet mean?

The bonnet is machined as part of the body, so there is no separate bonnet joint.

Does Seven Star LLC act as a FITOK distributor?

No. Seven Star LLC is an independent supplier in Muscat that sources FITOK products on request.

Documents and quotation

This page carries the official FITOK datasheet and manual for NGSS-FL4-7-Y. Seven Star LLC is an independent supplier in Muscat and sources FITOK products on request; tell us the quantity and delivery point to receive a quotation. Always confirm the order code and technical values in the documents first. See more in the product category.