Samson Type 3599 Axial Globe Valve NPS 4 to 48, Class 150-2500

Samson Type 3599 axial globe valve for high flow and critical service

The Samson Type 3599 is an axial globe valve, a compact control and on/off valve in which the plug sits directly in the pipeline axis rather than at a right angle to the flow. The datasheet lists nominal sizes NPS 4 to 48 (DN 100 to 1200), pressure ratings Class 150 to 2500 (PN 10 to 420) and a temperature range of –60 to +200 °C (–76 to +392 °F). Seven Star LLC supplies the Type 3599 in Oman and the GCC as an independent supplier in Muscat. The valve is aimed at liquids and gases where high capacity, tight control and noise or cavitation protection matter at the same time.

An axial design keeps the flow path straight, so the valve reaches high Cv values for its nominal size and wastes little pressure drop in the body. The actuator mechanism is separated from the process medium, converts a rotary motion into a linear plug movement and delivers high thrust, which is why the Type 3599 can be driven by any 90° rotary actuator and still hold accurate control on large sizes.

Type 3599 trim designations: STD, LDB, Cavless and DobCage

There is no long ordering code to decode on the 3599; the main choice is the cage, which defines how the valve behaves hydraulically and acoustically. All four trims use a balanced plug, which lowers the thrust the actuator must produce.

Type 3599 technical specifications

How the axial globe valve works

The medium passes through the valve in the direction of the arrow on the body. The plug position determines the open cross-section of the cage, so the cage geometry, not the body, sets the flow characteristic and the pressure-reduction behaviour. A rotating actuator stem keeps stem sealing emissions low, and the balanced plug lets a smaller actuator hold large pressure differences. In on/off valves without a cage the capacity can be even higher.

Where the Type 3599 fits in a plant

The Type 3599 sits in the control valve section of the Samson range alongside the Type 3591 and 3595 cage globe valves, which are already covered on this site. Choose the axial design when the line is large, the flow high and the space or weight budget tight. Samson lists all 90° rotary actuators as suitable drives; the positioner, limit switches and solenoid valves are selected with the actuator. For heavy-duty positioners and accessories see the Type 3730 and TROVIS 3793 families.

Selection checklist for a Type 3599

• Fluid, phase and the cavitation or flashing risk, which decides between STD and Cavless.
• Allowable noise level at the pipe wall, which decides between STD, LDB and DobCage.
• Required Cv at minimum and maximum flow, then NPS and pressure class.
• Flange type: ASME RF, ASME RTJ or DIN EN 558.
• Body and trim materials for the medium, including NACE or low-temperature needs where applicable.
• Metal-seat class IV or V, or soft seat for class VI shut-off.
• Linear or equal percentage characteristic.
• Rotary actuator type, fail-safe direction and positioner.

Installation, commissioning and maintenance of the 3599

Install the valve with the flow direction arrow on the body respected and with straight, supported piping, since large axial bodies can be heavy. The datasheet gives face-to-face lengths for each class; for example the NPS 4 Class 150 body is 432 mm and the NPS 6 body is 394 mm. Confirm the dimension table against the piping drawing, including actuator clearance, before release.

At commissioning, stroke the actuator over the full travel with the positioner, check the fail-safe action and record the leakage test result against the ordered class. Planned maintenance concentrates on the plug, the cage and the stem seal; keep a cage and seal kit for each installed trim type, and inspect cages in cavitating or abrasive service on a fixed interval.

Typical applications of the Type 3599 in Oman and the GCC

Large-bore, high-capacity control is common in gas export and compression lines, seawater and cooling water systems, power plant feedwater and condensate lines and downstream petrochemical headers. In these services, the Cavless cage addresses cavitating liquid let-down, and the LDB and DobCage cages address gas noise, which is a concern near occupied areas. The wide material list, including duplex and super duplex steel, helps with chloride-bearing seawater duty typical for coastal sites.

Information to send with your Type 3599 RFQ

• Medium, density or molecular weight, and phase.
• Upstream and downstream pressure and temperature at minimum, normal and maximum flow.
• Line size, pressure class and flange standard.
• Noise limit and cavitation data if known.
• Required leakage class and seat type.
• Body and trim material requirement and any special coating.
• Actuator, positioner and accessory preferences, hazardous-area classification.
• Project, tag numbers and delivery site.

Documents and quotation

The Samson data sheet T 8080 for the Type 3599 is attached on this page. Send your process data and we will confirm availability and lead time. Seven Star LLC is an independent supplier and does not claim any official status with the manufacturer.