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Brand: Samson
SAMSON Type 3591 Cage Globe Valve ANSI NPS 10-32
Description
SAMSON Type 3591 cage globe valve: large ANSI control valve for demanding process duty
The SAMSON Type 3591 is a maintenance-friendly cage globe valve in the Series 590 range, built for process plants that need high capacity at high differential pressure. In the ANSI version covered here it spans NPS 10 to 32 and Class 150 to 900. Instead of a conventional plug, it uses a pressure-balanced piston that slides inside a cage, so the actuator force stays moderate even at high pressure drop. Seven Star LLC supplies Type 3591 valves in Oman and the GCC as an independent supplier in Muscat.
The Type 3591 can be operated three ways:
- Type 3591-1: Type 3591 valve with a Type 3271 pneumatic diaphragm actuator.
- Type 3591 with a hydraulic piston actuator.
- Type 3591 with a pneumatic piston actuator.
Versions with a Type 3591-3 hand-operated actuator or a Type 3591-4 electric actuator are available on request.
Type 3591 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | SAMSON Type 3591 (Series 590, ANSI version); 3591-1 with Type 3271 actuator |
| Valve size | NPS 10 to 28 (Class 150 to 900) and NPS 32 (Class 150); NPS 32 Class 300 to 900 on request |
| Pressure rating | Class 150 to 900 |
| End connections | Flanges to ANSI; welding ends per ASME B16.25 |
| Body materials | A352 LCC, A216 WCC, A217 WC6 (cast steel); A351 CF8M (cast stainless steel) |
| Seat and piston | 410-2/1.4006 or CA6NM-B/1.4317 (steel bodies); 316L/1.4404 or CF8M/1.4408 (stainless body); Stellite facing on request |
| Seat-piston seal | Metal seal or high-performance metal seal (on request) |
| Characteristic | Equal percentage, linear or modified linear (equivalent to quick opening) |
| Leakage class (ANSI/FCI 70-2) | Class IV with balanced piston (PTFE or graphite ring); class V with PTFE ring on request |
| Pressure balancing seal | PTFE with carbon, or graphite |
| Packing | PTFE with carbon (self-adjusting or adjustable) or adjustable high-temperature packing |
| Body gasket | Graphite seal on metal core |
| Body temperature, no insulating section | −10 to +220 °C (14 to 428 °F); to +350 °C with high-temperature packing |
| Valve piston, balanced | PTFE: −46 to +220 °C; graphite: −46 to +500 °C |
How the Type 3591 piston-and-cage design works
The piston moves inside a cage that is suspended in the valve body. Its position, together with the cage shape, defines the free flow area. Since the piston is pressure-balanced as standard, the line pressure acts on both sides and the stem thrust required to move it is much lower than for an unbalanced plug. The piston stem is joined to the actuator stem with a stem connector and sealed by PTFE or graphite packing. An external anti-rotation fixture on the yoke assembly keeps the piston stem from turning.
Two seat styles are offered. With the flanged seat, the seat is bolted into the seat bridge; with the clamped-in seat the cage and seat can be removed quickly for service. For noise-sensitive lines, a multi-hole cage or a Combi Cage can be selected, and the KVS tables are given separately for those cages.
Type 3591 temperature ranges by body material
With an insulating section the body temperature range widens, depending on casting:
| Body material | Range with insulating section |
|---|---|
| A352 LCC | −46 to +345 °C |
| A216 WCC | −29 to +425 °C |
| A217 WC6 | −29 to +500 °C |
| A351 CF8M | −46 to +500 °C |
Where the Type 3591 fits and related parts
Within Series 590 the Type 3591 is the ANSI cage valve for larger line sizes (NPS 10 and up). The Type 3595 is a related cage-guided globe or angle valve that covers smaller sizes and higher classes, up to NPS 32 and Class 2500, with specialised trims. Common companions to the Type 3591 are the Type 3271 actuator, the Type 3273 side-mounted handwheel, positioners, limit switches and solenoid valves mounted to IEC 60534-6-1 and NAMUR interfaces.
Selection and ordering checklist for the Type 3591
The datasheet’s selection steps and ordering text translate into the following checklist:
- Calculate CV (KV) to IEC 60534 for all flow cases, then choose valve size and CVmax from the coefficient tables (travel 60 to 400 mm).
- Choose body material from the pressure-temperature diagram.
- Decide on trim: metal seal or high-performance metal seal, characteristic, standard or noise-reducing cage.
- Pick the actuator: Type 3271 diaphragm, hydraulic or pneumatic piston.
- State fail-safe action: fail-close (stem extends) or fail-open (stem retracts).
- Define process data: density and temperature, flow, upstream pressure p1 and downstream pressure p2, each at minimum, normal and maximum flow.
- List accessories: positioner, limit switch, solenoid valve, handwheel.
Installation, commissioning and maintenance
Valves of NPS 16 (Class 300 to 900) and NPS 20 (Class 150 to 900) up to NPS 32 (Class 150) can be fitted with lifting eyelets because the assemblies are heavy; use them, and never lift the valve by the actuator. Install in the direction of flow indicated on the body. After commissioning, verify the stroke against the positioner and check the packing for leakage. For maintenance, remove the actuator and bonnet, lift out the cage and piston, and inspect the seat, seal ring and graphite gasket; keep a spare soft ring and gasket set on site.
Typical applications in Oman and the GCC
Large cage valves of this class appear in gas gathering and processing plants, feedwater and condensate systems at power and desalination stations, refinery and petrochemical let-down and recirculation lines, and pipeline pressure control. Heat, sand-laden air and high humidity put a premium on good coatings, clean instrument air, and sealed positioners.
Information to send with an RFQ for the Type 3591
- Valve size NPS, Class, body material and end connection.
- Fluid data and flow, p1, p2 and temperature for all cases.
- Noise limits, leakage class and characteristic.
- Actuator type, fail-safe action and accessories.
- Project specification, tag number and delivery location.
Documents and quotation
The SAMSON T 8075 datasheet for the Type 3591 is attached on this page and holds the coefficient tables, dimensions and weights for each size.
Send the Type 3591 size, class and process data and Seven Star LLC will quote supply to Oman and the GCC.
Datasheets & Documents
- Datasheet SAMSON Type 3591 Datasheet T 8075 Download
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About brand
SAMSON is a German manufacturer of control valves, actuators, positioners and self-operated regulators. Hermann Sandvoss founded the company in Düsseldorf on 1 April 1907, and its first important product was a thermostatic valve that controlled temperature without external power. After moves to Mannheim, SAMSON settled in Frankfurt am Main in 1916, where SAMSON AG is still headquartered.
Seven Star LLC supplies Samson control valves, pneumatic actuators and positioners to process plants in Oman, including the types listed on this page and their replacement units.
Samson company profile
| Founded | 1 April 1907, Düsseldorf, by Hermann Sandvoss, as VULCAN Technische Apparate Baugesellschaft; products sold under the SAMSON name |
|---|---|
| Headquarters | Frankfurt am Main, Germany, since 1916 |
| Legal form | SAMSON AG |
| First product | A self-operated thermostatic valve |
| Group brands | SAMSON together with PFEIFFER, LEUSCH, VETEC and AIR TORQUE |
| Product families | Globe valves such as Type 3241, rotary and butterfly valves, 3271 and 3277 pneumatic actuators, 3730 and 3731 positioners, self-operated pressure and temperature regulators |
Milestones
- 1907: Hermann Sandvoss founds the company in Düsseldorf.
- 1909: It is re-established as SAMSON Apparatebau GmbH.
- 1916: After a period in Mannheim, the company moves to Frankfurt am Main.
- 1975: The name becomes SAMSON Mess- und Regeltechnik.
Samson valve, actuator and positioner types
Samson builds a control valve from modules. The Type 3241 globe valve is the general-service body of Series 240, and the Type 3251 is the Series 250 body for higher pressure ratings. Either one is combined with a Type 3271 pneumatic diaphragm actuator or a Type 3277, whose yoke allows the positioner to be attached directly with a concealed travel linkage.
Among the positioners listed are the Type 3725 and the Type 3730 family: the 3730-1 as the basic electropneumatic version, sold in its current generation as TROVIS 3730-1, and the 3730-3 with HART communication and valve diagnostics. Samson also makes PROFIBUS PA and FOUNDATION fieldbus variants in the same family, plus self-operated pressure and temperature regulators.
Where Samson valves are used
Samson control valves throttle steam, gas and liquids in chemical and petrochemical units, refineries, gas processing, power stations, water and desalination plants, and food production. Many reach site as part of a skid or package, so the plant instrument team often meets them first when a positioner or actuator needs replacing. We supply these items to end users and contractors throughout the GCC.
Samson products we list
Ordering Samson parts: what we need
Every Samson device has a nameplate with the type, a configuration ID (Var-ID) and a serial number. A photo of that plate is the surest route to an exact match. Without it, please send:
- Valve: type, DN or NPS, pressure rating, body and trim material, Kvs or Cv, plug and seat style, packing and bonnet type
- Actuator: type, effective area in cm², bench range, fail action and travel
- Positioner: full type code including Ex protection, communication and options such as limit switches or position transmitter
We check the code against Samson documentation and provide the manufacturer's data sheet on request.
Facts checked against SAMSON's corporate chronicle and press material, October 2026.
Browse Samson products by category: Control Valves, Valve Positioner, Valve Actuator.
FAQ
Questions about the SAMSON Type 3591 Cage Globe Valve ANSI NPS 10-32
Answers from our engineering team on installation, compatibility and integration.
01What sizes and classes does the Type 3591 cover?
The ANSI Type 3591 covers NPS 10 to 32 with Class 150 to 900 pressure ratings. The standard version is NPS 10 to 28 for Class 150 to 900 and NPS 32 for Class 150; NPS 32 in Class 300 to 900 is available on request.
02Why does the Type 3591 use a balanced piston?
The pressure-balanced piston lets line pressure act on both sides, so the actuator needs much less force at high differential pressure. This is the reason the design suits high-pressure drop control.
03Which actuators can drive the Type 3591?
The standard version uses the Type 3271 pneumatic actuator (Type 3591-1), or a hydraulic or pneumatic piston actuator. Hand-operated and electric actuators are available on request.
04What leakage class does the Type 3591 achieve?
Class IV per ANSI/FCI 70-2 with the balanced piston and a PTFE or graphite ring. Class V with a high-performance metal seal and PTFE ring is available on request.
05Can the Type 3591 be fitted with noise-reducing trim?
Yes, a multi-hole cage or a Combi Cage can be selected, and separate KVS/CV tables apply to those versions.
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