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Brand: Swagelok
Swagelok SS-4MG Medium-Flow Metering Valve
Description
Fine flow adjustment in a compact 1/4 in. tube-fitting valve
The Swagelok SS-4MG is a straight-pattern metering valve from the M series, built in 316 stainless steel with 1/4 in. Swagelok tube fitting ends. Its tapered regulating stem lets an operator set small, repeatable gas or liquid flows, so it is used on analyzer sample lines, rotameter and flowmeter inlets, purge and bleed lines, calibration gas panels and laboratory or pilot-plant rigs where an ordinary needle valve is too coarse. The maximum flow coefficient is 0.03 Cv.
Because the stem is tapered at 3 degrees and the valve is not rated for shutoff service, a separate isolation valve should be installed where tight closure is needed. A lock screw in the handle fixes the setting once the flow has been trimmed.
Technical specifications
Values are taken from the Swagelok catalog Metering Valves, S, M and 31 Series (MS-01-142) and the Swagelok product page for SS-4MG.
| Parameter | Specification |
|---|---|
| Ordering number | SS-4MG (straight pattern); brass equivalent replaces SS with B |
| Series | M series metering valve, medium flow |
| End connections | 1/4 in. Swagelok tube fittings, both ends |
| Flow coefficient (Cv) | 0.03 maximum; straight pattern |
| Orifice | 0.056 in. (1.42 mm) |
| Stem taper | 3 degrees included angle; no shutoff service |
| Working pressure | 1000 psig (68.9 bar); downstream pressure 500 psig (34.4 bar) maximum when the valve must be adjusted under pressure |
| Temperature rating | -10 to 400 F (-23 to 204 C) with standard fluorocarbon FKM O-rings; -10 to 300 F (-23 to 148 C) with Buna N |
| Body and bonnet | 316 stainless steel (body A182, bonnet A479) |
| Stem | 316 stainless steel, hard chrome plated (A479) |
| Handle | Knurled stainless steel handle with lock screw |
| Panel mounting | Panel hole 0.58 in. (14.7 mm); maximum panel thickness 0.13 in. (3.3 mm) |
| Factory test | Nitrogen at 1000 psig (69 bar); shell test with liquid leak detector, no detectable leakage |
| Cleaning | Standard cleaning and packaging SC-10; SC-11 optional by adding -SC11 |
Flow data and ordering variants
At 70 F (20 C) the M series passes 0.33 std ft3/min of air (9.3 std L/min) at a 10 psi (0.68 bar) drop to atmosphere, 0.90 std ft3/min (25.4 std L/min) at 50 psi (3.4 bar) and 1.5 std ft3/min (42.4 std L/min) at 100 psi (6.8 bar). Water flow at the same drops is 0.09, 0.21 and 0.30 U.S. gal/min.
| Ordering number | Configuration |
|---|---|
| SS-2MG | 1/8 in. Swagelok tube fittings, straight |
| SS-4MG | 1/4 in. Swagelok tube fittings, straight (this model) |
| SS-4MG2 / SS-2MG2 | 1/4 in. / 1/8 in. male NPT |
| SS-MGVR4 | 1/4 in. male VCR face seal |
| SS-4MA / SS-2MA | Angle pattern, 1/4 in. / 1/8 in. tube fittings |
| SS-4MGD | Double pattern, 1/4 in., Cv 0.026 |
Option suffixes add a vernier handle (-MH), slotted handle (-SL), stem O-ring materials (-BU Buna N, -EP ethylene propylene, -VI fluorocarbon, -KZ Kalrez, -NE neoprene) and special cleaning (-SC11).
Selection and installation notes
Match the O-ring to the fluid and temperature: Buna N and ethylene propylene are limited to 300 F (148 C), neoprene to 250 F (121 C), and the standard FKM reaches 400 F (204 C). For oxygen service, review Swagelok report MS-06-13 and request the appropriate cleaning. Where the valve has to be adjusted under line pressure, keep downstream pressure at 500 psig (34.4 bar) or below because of the fine-pitch threads. A sister needle valve with positive shutoff is listed as the Swagelok SS-1RS4 integral bonnet needle valve.
Documents and quotation
The attached catalog carries the flow curves, material tables, dimensions and option kits. Before ordering, confirm the required Cv, end connections, O-ring material, handle type and whether panel mounting is needed. To request a quotation, send the ordering number, quantity and cleaning requirement; more valves of this type are grouped under Globe Valves.
Datasheets & Documents
- Catalog Swagelok Metering Valves S, M and 31 Series catalog (MS-01-142) Download
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About brand
Two-ferrule tube fittings made Swagelok a familiar name on instrument air headers, impulse lines and analyzer sample systems. The company has made fluid system components since 1947 and is based in Solon, USA. Seven Star LLC sources and supplies Swagelok tube fittings, ball valves, needle valves, quick-connects, face seal fittings and pressure regulators for plants in Oman, checking every ordering number against the manufacturer's catalog before an offer is made.
Swagelok product families listed here
The items on this page cover the small-bore components an instrument technician handles most often. Swagelok tube fittings join metric and fractional tubing without threading or welding. Swagelok ball valves are represented by the 40 series, the 40G series one-piece instrumentation ball valve (for example SS-43GS4) and the three-way pattern listed as 40GX. The SS-1RS4 is an integral bonnet needle valve from the 1 series. VCR metal gasket face seal fittings serve high-purity and vacuum lines, QC series quick-connects are used where lines are coupled and uncoupled often, and the KPR series is a pressure-reducing regulator.
Where Swagelok components are used
Typical duties are transmitter hook-ups, manifolds and impulse tubing, analyzer shelters and sample conditioning panels, chemical injection skids, gas cylinder panels in laboratories, and test benches. In oil and gas service across the GCC, the usual questions are material grade, pressure rating at temperature and, for sour service, whether the manufacturer offers the item to NACE MR0175 requirements.
Ordering Swagelok fittings and valves: what we need
A Swagelok ordering number carries most of the specification. In SS-43GS4, SS is 316 stainless steel, 43G identifies the valve series and size, and S4 is a 1/4 in. Swagelok tube fitting end connection. Send the complete ordering number including any suffix for handle, seat or cleaning option. If you do not have it, give us the tube outside diameter and wall thickness, body material, end connections on each port, working pressure and temperature, and the fluid. For a KPR regulator we also need inlet pressure, the outlet control range and the port configuration.
Browse Swagelok products by category: Pipes & Fittings, Regulators, Fittings & Valves.
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Frequently Asked Questions
What is the maximum flow coefficient of the SS-4MG?
The M series reaches 0.03 Cv at full open, with a 0.056 in. (1.42 mm) orifice.
Can the SS-4MG be used for tight shutoff?
No. The catalog lists M series metering valves as not rated for shutoff service. Fit a separate isolation valve if tight closure is required.
What pressure and temperature does the SS-4MG handle?
Working pressure is 1000 psig (68.9 bar). Temperature is -10 to 400 F (-23 to 204 C) with standard FKM O-rings, or to 300 F (148 C) with Buna N.
Is the SS-4MG available with NPT or VCR ends?
Yes. Related ordering numbers include SS-4MG2 with male NPT and SS-MGVR4 with male VCR face seal fittings.
Can the flow setting be locked?
Yes. A lock screw in the handle fixes the setting, and vernier or slotted handles are available for repeatable adjustment.
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