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TECHNICAL BULLETIN
Valtek FlowTop Control Valve
FCD VLENTB0060 – 11/09 (Replaces FCD-VLATB060)

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Valtek FlowTop Control Valves

FCD VLENTB0060-01 11/09

Body Assembly
Many high quality packing systems available: Including UltraGuard environmental packing, which exceeds EPA requirements. Certification for up to 5 years; no maintenance required (see Figure 18)Zero external leakage at the body to bonnet joint: Graphite gasket eliminates leakage and minimizes torque requirements. Multiple equally spaced body bolts ensure optimal gasket loading

Stable plug travel over entire stroke of the valve: Solid, sturdy post style guide minimizes vibration and wear.

Highest globe valve C v’s on the market: The pop belly shaped gallery enables flowTop to havehigher C v’s per trim size, and valve size than all other globe valves on the market.

Up to 10 C v values available per valve size: No need to lap the plug and seat

Very low seat leakage: A solid graphite seat gasket provides excellent shut-off. No lapping or grinding required to achieve class 4 shut-off. No more messy lapping compound.

Figure 1: FlowTop Control Valve Body Assembly TheFlowTop control valve is a high-performance, general service valve coupled with the high thrust FlowAct pneumatic diaphragm actuator. The Logix 500 positioner is mounted standard on FlowTop control valves. The Logix 500 simplifies and reduces calibration time to 20 seconds or less by pushing two buttons. The easily installed HART compatible positioner make the FlowTop/Logix 500 combination the bestchoice for general service valve applications. There is no need for additional software or software support and upgrades. Handheld devices are not needed to calibrate this valve, making it the highest performing, low cost solution for general service valves. The Pop-belly shaped gallery give the FlowTop more C than all the other globe valves on the market. Designed for use in ANSI Class 150 or 300service applications, the FlowTop control valve is capable of operating within temperatures ranging from -500 to 8000 F (-460 to 4270 C). The FlowTop control valve is available in sizes 0.5 to 4 inches with a carbon steel or stainless steel body. It features flow under, single seated trim with a post-guided valve stem to eliminate cage guiding problems. Heavy duty parts constructed of corrosionresistant materials provide extended valve life.

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Valtek FlowTop Control Valves

FCD VLENTB0060-01 11/09

Actuator Assembly
Compact design with many spring ranges available for use with or without a positioner: High quality long life springs properly aligned by diaphragm plates Radial spring arrangement allows low mounting height

Equally spaced spring compression bolts: For use if apress is not available to unload springs Fast response times: Due to low volume of air between the diaphragm and the case Diaphragm capable of 90 psi: Long life rolling diaphragm. Diaphragm assembly is capable of air supplies up to 90 psi, which minimizes actuator size saving money and installed space Stable guiding system Zero stem leakage: Durable, robust, long life actuator stem seal. Stabilizesstem travel and prevents side loading of seals increasing life over all other diaphragm actuators on the market. Uninterrupted linear travel, or loss of operating force: Due to fabric reinforced rolling type diaphragm with minimum area variation External air supply: All NAMUR mounted positioners use external tubing. The internal passage to the yoke is plugged in these cases. Direct air supply: Airis ported through the internal passage in the yoke. Available only with direct mount positioners on air to open applications. No tubing is required. The external supply port is plugged in these cases. High quality ductile iron yoke: A high quality durable solid ductile iron yoke

Figure 2: FlowAct 252 ATO/FC Diaphragm Actuator The FlowAct actuator is compact, reversible and capable of...