RTK-Stem Guided Control Valves

Offering precise control and modulation of fluid flow in industrial processes, ensuring optimal performance and efficiency.

Control and Shut-Off Valves | Variety of Trim Designs in Different Materials | Electric and Pneumatic Actuators as Standard

Sizes 1/2 – 12” (15mm – 300mm) | ANSI Class 150 – 900 (PN16 – 160)

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Specifications

Body Assembly:

Style: Single seated, top entry bolted bonnet, globe style body, stem guided unbalanced plug

Size, Ratings:

Two Way*
150# 1⁄2” – 12”
300# 1⁄2” – 12”
*21⁄2” only available in 150# & 300#

Three Way 150# 1” – 12” 300# 1” – 12”

Body Materials:

Carbon Steel, ASTM A216 WCB
(Class 150 – 900)
Stainless Steel, ASTM A351 CF8M
(Class 150 – 900)
Chrome Moly, ASTM A217 WC9
(Class 600 & 900)

Bonnet:

Bolted Bonnet – Bonnet with cooling fins for high temperatures. Extended bonnet for valves with bellows seal.

End Connections:

Flanges according to ANSI B16.5 RF (Raised Face)
Butt Weld Ends according to ASME B16.25 – 2007

Threaded NPT Connections (up to 2”)

Dimensions (face-to-face) per ANSI/ISA-S75.03 (DIN EN 558-1)

Stem Packing:

PTFE/Graphite: -76°F to 482°F (-60°C to 250 ̊C)
Pure Graphite: -76°F to 986°F (-60°C to 530 ̊C)
Bellows Seal: -76°F to 662°F (-60°C to 350 ̊C)
Chloroprene: -40°F to 212°F (-40°C to 100 ̊C)

Plug Types & Flow Characteristics:

On/Off Plug (Quick Opening)
Parabolic Plug (Equal Percentage or Linear)
V Port Plug (Linear)
Perforated Plug (Equal Percentage or Linear)
Mixing Plug (Linear)
Diverting Plug (Linear)

Trim Materials:

Plug 1.4122 (Martensitic) Stem and Seat AISI 316 Ti Optional:
Plug AISI 316 Ti
Parabolic Plug stellited or hardened
Perforated Plug hardened

Shutoff Class (ANSI/FCI 70-2):

Standard Trim Class IV (<0.01% Cv) metal seat.
Standard Trim Class IV – S2 (<0.005% Cv) metal seat, lapped in.
Soft Seat Class VI (tight closing) with PTFE max +392 ̊F.
Diverting Plug port B Class Ill (<0.1% Cv).

Actuators:

Standard: Pneumatic Spring & Diaphragm and Electric.
Optional: Customer specified actuators (Electric, Pneumatic and Hydraulic).

Trim Designs

Characteristic: On/Off (Quick Opening).
Flow direction: To open or to close.

This plug provides maximum flow with minimum pressure drop and is ideal when large flows are required just after opening.

Characteristic: Linear.
Flow direction: To open or to close.

This plug is ideally suited when actuator selection is critical, and the shorter stroke
means smaller actuators can often be used.

Characteristic: Linear.
Flow direction: A + B > AB

Speciality Valves

Characteristic: Linear or Equal Percentage.
Flow direction: To open.

This plug covers all Cv ranges and is especially suitable for low differential pressures.
The equal percentage flow characteristic provides excellent low flow control.

Characteristic: Linear or Equal Percentage.
Flow direction: To open or to close.

The perforated plug is suitable for use where high differential pressures are present. It can also be used where noise is an issue, typically reducing the noise level by 10dBA. The hardened version improves life expectancy in cavitation and/or flashing conditions.

Characteristic: Linear.
Flow direction: AB > A , B

Speciality Valves

Parabolic Plug with linear characteristic for precise control of blowdown rate. Hardened trim for low wear operation. Available with or without manual sample valve.

Specially designed to Protect Feedwater Pumps against cavitation by combining boiler feedwater valve and By-pass valve in one. Adjustable recirculation rate up to 10% of Cv value. Hardened recirculation plug and seat for low wear operation.

Available in either pneumatic or manual design. Hardened trim for low wear operation. Protection of stem packing by back sealing when the valve is opened.

Used to Reduce Noise for steam and gases. Also used to suppress cavitation and reduce noise for liquids. Available with two to four throttle plates included in pipe expansion.