SAMSON Type 3310 Segmented Ball Control Valve

Overview

The SAMSON Type 3310 is a segmented ball valve for throttling or on/off service in industrial applications with high flow rates. Instead of a full ball, it uses a V-profiled ball segment that rotates through up to 90 degrees against a seat ring, combining the high capacity of a rotary valve with fine control at small openings. The SAMSON Type 3310 is available in DIN and ANSI versions from DN 25 to 300 (NPS 1 to 12) in PN 16 to 40 and Class 150 to 300, with temperatures from −46 to +450 °C when fitted with an insulating section. It is combined with SAMSON Type SRP single-acting or Type DAP double-acting pneumatic rotary actuators, or with the Type 3278 single-acting rotary actuator.

Seven Star LLC supplies the SAMSON Type 3310 as complete rotary control valve assemblies, with actuators, positioners and solenoid valves, to customers in Muscat, across the Sultanate of Oman and the GCC. We provide engineering support in Muscat for valve sizing using the SAMSON flow coefficient tables and for configuring fail-safe action.

Operating Principle

In the SAMSON Type 3310 the medium flows into the convex face of the segmented ball. When the valve is closed, the process pressure acts on this convex side and presses the segment against the seat. As the shaft turns, the V-shaped opening between ball edge and seat ring grows, and the flow coefficient is determined by the opening angle. SAMSON publishes CV and KVS values in 5 to 10 degree steps, together with the FL and XT factors needed for sizing and noise calculations. For abrasive media, the direction of flow can be reversed to reduce wear on the body.

A notable feature of the SAMSON Type 3310 is that one valve can provide two characteristics. With the standard mounting, the actuator turns clockwise to close and the valve has a modified equal percentage characteristic; with the actuator converted to turn counterclockwise to close, the characteristic becomes modified linear. Rangeability is 100:1 or better. With the Type SRP or Type 3278 actuator the valve can be fail-close or fail-open on loss of supply air, while the spring-less Type DAP actuator has no defined final position on air failure and is chosen where the valve should stay put or be driven by a separate safety system.

Engineering Design of the SAMSON Type 3310

The SAMSON Type 3310 body is cast steel 1.0619 or A216 WCC, or cast stainless steel 1.4408 or A351 CF8M, with flanges to DIN EN 1092-1 or ANSI B16.5 and face-to-face dimension to DIN EN 558-2 Series 36. The segmented ball is 1.4404 or 1.4409 (316L or CF3M) and chrome plated as standard. Two seat designs are available: a soft seal seat ring in PTFE reinforced with stainless steel (up to 220 °C) or PEEK, giving leakage class VI to ANSI/FCI 70-2, and a metal seal in ARCAP AP1C copper alloy, giving leakage class IV. The shaft is 316L, or AISI 630 for DN 150, and runs in plain bearings, with a spring-loaded PTFE V-ring packing.

The standard version covers −29 to +220 °C. Further versions listed by SAMSON include double packing with or without leak monitoring, an insulating section for a wider temperature range, special flange faces, an additional handwheel or manual override, a heating jacket, FDA and NSF H1 compliant gaskets and lubricants, extra seals to protect the bearings, and a version for gaseous oxygen up to 13.8 bar. Accessories mount to VDI/VDE 3845 on SRP and DAP actuators, and SAMSON accessories can be attached directly to the Type 3278.

Key Features

Key features of the SAMSON Type 3310 from SAMSON data sheet T 8222 are:

• Segmented ball design for high flow capacity, up to KVS 2650 (CV 3100) at 90 degrees for DN 250 and 300.
• Throttling or on/off service with rangeability of 100:1 or more.
• Equal percentage or linear characteristic selected by the actuator rotation direction.
• Soft seal for leakage class VI or metal seal for leakage class IV.
• Chrome-plated stainless steel segmented ball for wear resistance.
• Cast steel or cast stainless steel bodies in DIN and ANSI versions.
• Flow direction can be reversed for abrasive media.
• Fail-close or fail-open action with Type SRP or Type 3278 spring-return actuators.

Industrial Applications

The high capacity and wide rangeability of the SAMSON Type 3310 make it a cost-effective alternative to large globe valves in liquid and gas lines. Typical applications include cooling water and seawater systems, pulp and slurry lines, fuel gas and natural gas flow control, steam and condensate service at moderate pressure, and filling and dosing in chemical plants. The soft-seated version is often used where tight shut-off is required alongside control, and the metal-seated version where temperature or abrasive particles would damage a polymer seat. In food and pharmaceutical utilities, the FDA and NSF H1 compliant options of the SAMSON Type 3310 are relevant.

In Oman and the GCC the SAMSON Type 3310 suits desalination intake and brine lines, district cooling and HVAC central plants, water treatment works, gas processing utilities, and process plants in Sohar, Duqm and Salalah where large flows must be throttled economically. For sizing, Seven Star LLC can work from your process data with the SAMSON CV and KVS tables and supply the SAMSON Type 3310 with the actuator, positioner and limit switches required for the loop.

Technical Specifications

The SAMSON Type 3310 data below are taken from SAMSON data sheet T 8222 EN (edition April 2020).

How to Order

For a quotation on the SAMSON Type 3310, send Seven Star LLC your medium, flow rates, pressures and temperatures, valve size, pressure rating, body and seat material, required leakage class and fail-safe action. The SAMSON data sheet T 8222 is available as a download on this page. Seven Star LLC supplies SAMSON control valves in Oman and the GCC with engineering support in Muscat. See also the SAMSON Type 3241 Globe Control Valve, the SAMSON TROVIS 3730-1 Electropneumatic Positioner and the SAMSON Type 3725 Electropneumatic Positioner.