Your control valve solution provider
Koso Parcol is s an Italy-based company, founded in 1954 and belonging to Nihon Koso Co. Ltd – Japan. We are committed to providing tailor made solutions to our customers, to support them in every stage of their industrial development
1-6940
Koso Parcol Globe Control Valves
VeGA cage, quick change trim
1/2″ up to 24″
up to ANSI 2500
VeGA is the most Versatile control valve for General Applications ever designed by Parcol.
VeGA is a straight body single seat control valve with cage guided balanced plug designed to withstand the most severe process conditions.
The special plug design allows improving valve range-ability by reducing minimum controllable flow and plug erosion.
The high pressure recovery factor value compared with conventional contoured plug control valves ensure higher flow rates on compressible fluid service and reduces cavitation risk and effects on liquid service.
All versions have quick change trim.
Koso Parcol Low Noise, Anti-cavitation for Severe Service Application
1″ up to 36″ up to ANSI 4500#
Specifically studied for severe service applications, LIMIPHON valves were designed and built by Parcol in 1971.
Typical services where LIMIPHON valves are indicated :
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Compressor recycle (antisurge )
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Blowdown to vent or flare
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Natural gas pressure reducing stations (anti-icing effect)
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Steam turbine by-pass stations
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Feedpump recirculation
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Feedwater start-up (see also Parcol VARISTEP valve)
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Pump test loops
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Superheater/reheater attemperator spray
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Deaerator level control
LIMIPHON control valves are available in Angle, Straighy-way or Z-type style.
1-6962
Koso Parcol Varistep
Anticavitation design 3″ up to 16″
ANSI 2500
VARISTEP, an extrapolation of LIMIPHON design, has been engineered by PARCOL in order to better prevent cavitation phenomenon, without limiting the capacity at regimes not subject to cavitation.
Main features are a radial section expansion designed both to minimize the pressure drop at last stage (the most sensitive to cavitation) and, at the same time, to limit the pressure drop at first stage.
Less stages from bottom to top of the stack, resulting in an increase of the incremental Cv along the travel. Capability to comply with the pressure drop decrease at high flow rates, usually occurring in boiler feed water applications.
1-6940
Koso Parcol Cryogenic Service
VeGA cage, quick change trim,
3/4″ up to 24″ up to ANSI 2500
VeGA Cryo 1-6940 control valves are designed for very low temperatures (up to -196°C) encountered in the cryogenic industry and in natural gas liquefying plants (NGL).
Made with materials selected specifically for this type of service, Vega Cryo valves are normally tested immersed in liquid nitrogen, using helium as the test fluid in accordance with standard BS6364.
1-5000
Koso Parcol Pressure Reducing and Desuperheating Stations
Angle with downstream water
injection port size 4″ up to 17″ up to
ANSI 4500#
Parcol 1-5700 Pressure Reducing and Desuperheating stations (PRDS) represent the most universal and compact solution for pressure reduction and desuperheating service of steam turbine by-pass lines, discharging both to intermediate or low pressure sections of power stations.
The spherical body shape design, together with the high quality of construction materials, allow a more uniform wall thickness than the conventional ones, fabricated by welding bodies, reducing P/T fatigue effects and improving welded joints quality.
The pressure reduction is mainly achieved through two stages: the first stage has the function to adjust the flow rate by means of a drilled cage trim, the second stage, designed with fixed throttling section, has the double function to generate a backpressure on the first stage by reducing fluid velocity and generated sound pressure level, and to convey the steam towards the injection chamber, at speed and distribution suitable to optimize the desuperheating process.
1-9400
Koso Parcol Letdown Stations with Limiphon trim
-9416 Limiphon valve angle body
with bottom inlet - sliding and
adjustable body/bonnet gasket -
balanced plug - filter under seat - V
leakage class
1-9000 series Limiphon valves are widely used in steam pressure reduction and desuperheating stations, quite frequent in turbine by-pass lines.
As a matter of fact:
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The pressure reduction takes place through paths whose section changes with the flow rate, thus granting the fluid velocity control in any operation condition
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The fluid velocity control allows to limit the noise generated by the valve and grants the absence of vibrations and trim wear
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The Limiphon trim has no construction limits as far as number of stages (so called "lunettes", due to their particular shape) and expansion of flow paths section are concerned. Therefore there are no practical limits for Δp and p1/p2 ratio as required by the process.
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Limiphon valves may be sized in order to generate noise pressure levels comparable to the ones caused by the fluid flowing inside the piping. In this case they could not be essential for predicting the noise level produced by the whole line.
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Unlike the valves provided with fixed section silencer installed downstream, Limiphon valves are the technically ideal solution for the above process, as well as for all applications where a strong pressure reduction takes place and regular vibration-free operation, maximum noise reduction under significant load changes are required.
1-4442
Koso Parcol Spraysat Desuperheater
Angle with downstream water
injection
DN 1″ x 3″ up to 3″ x 6″
up to ANSI 1500#
PARCOL 1-4442 series Spraysat multiple nozzle desuperheaters (variable area) are designed to provide optimum performances and high rangeability.
The independent spray nozzles progressively activated by the throttling piston, provide a good water atomization down to minimum flow conditions.To improve the quality of atomization and accuracy of temperature control, several sizes of spray nozzles are available. The built-in control system is very compact, reliable and easy to operate. The split body design allows to change easily the orientation of water connection versus the steam piping and greatly facilitate the seat replacement.
3-4000
Koso Parcol Probe Desupeheater
3-4000: variable area nozzles
water side 1/2" up to 2"
steam side 2" up to 6"
ANSI 1500#
PARCOL 3-4000 series desuperheaters are almost solely used to reduce the steam temperature by directly injecting water inside the superheated steam flow.
TThe above series includes 3-4100 variable area and 3-4500 fixed area models. LV variable area series, including LVL, LVP and LVM models, allows to solve the most common desuperheating problems without practical limits in flow rate and operating conditions.
Fixed area LF nozzles, on the contrary, are designed for limited power processes with limited load changes.
1-6942
Koso Parcol Urea Globe Control Valves
Low pressure urea service
1/2" up to 8"
up to ANSI 600#
1-6942 globe control valves are designed and manufactured specifically for the medium and low pressure sections of Urea Plants.
Available either in straight way or angle execution, this control valve series is provided with integral plug and stem and special guide bushing in order to avoid any dead zones inside the valve.
Body jacketing is available as an option.
1-4500
Koso Parcol Melamine Angle Control Valves
size on request up to PN325
Melamine is a colourless substance, a heterocyclic aromatic compound with nitrogen. Melamine is the starting material for the production of melamine resins which are used as glues and adhesives or are converted to thermosets.
Control Valves for this specific service shall be able to deal with highly corrosive, high pressure cristallizing fluid.
1-4500 series is featured with a special body design for a smooth flow pattern, absence of bonnet and gaskets, and integral jacketing with thermal oil for body and flanges.
1-4800
Koso Parcol Urea Angle Control Valves
High pressure urea service
3/4″ up to 12″ up to PN420
urea grade SS, 25-22-2 SS
1-4800 angle, split body control valves are designed and manufactured so as to grant good service and longer trouble free life with very reduced maintenance.
The original and simple design of PARCOL valves as well as the right selection of the part materials result in great success of the same.
PARCOL has started the production of specialty control valves for urea plants in 1965; at present, approximately 200 production units where Parcol valves are installed run with full satisfaction.
Materials are adequate for urea and carbamate fluids and comply with the material specifications for this service of main Licensors such as Snamprogetti, Stamicarbon, Urea Casale and others.
Connections are obtained directly on the single piece that constitutes the valve body in order to keep down the weight, whereas the shape of internals does not leave dead zones. In fact dead zones are a cause for corrosion since carbamate strengthens its corrosive action particularly in these zones due to the failure of oxygen protection (passivation).
4-3111
Koso Parcol Urea Three Way Control Ball
4-3111 series three way ball valve for urea plant application is typically used to control urea melt to the prilling tower.
The design is provided with heating jacket and the material selection ensure extended trouble free operations with reduced maintenance.
3-5483
Koso Parcol Urea Safety Valves
API 520 Series
1″x2″ up to 10″x12″ up to ANSI 2500#
The new series VSU 3-5403 universal pressure safety relief valves represents the third step in evolution of the first series 3-5401 dated 1989.
The new series geometry is moulded by demanding experimental tests campaign supported by CFD and FEM analyses. Experimental tests, both on compressible (air) and incompressible (water) fluids, with and without back pressure, were performed according to PED requirements (standard ISO 4126-1 and working draft ISO 4126-11).
With respect to previous series VSU 3-5402, the new series still provides high quality overpressure protection with the same valve on gas, steam, vapour, liquid and two-phase mixtures services and, in addition, offers dramatic improvement of discharge flow rates under back pressure conditions.
1-2311 / 1-2611
Koso Parcol Urea Butterfly Control Valves
size on request up to PN325
1-2311 and 1-2611 High Pressure butterfly control valves have one-piece body and disc obtained from forged block of specialty stainless steel and special packing design to warrant maximum reliability.
Trim materials have been selected by testing on various urea plants for many years to ensure maximum reliabilty and performance.
1-2311 is privided with swing through design, while 1-2611 is the double eccentric design.
1-2500
Koso Parcol Swing Through Butterfly Valves
up to 80" - ANSI 600#
1-2500 series control valves feature a swing through type disc plug suitably profiled to reduce the dynamic torque transmitted by the fluid and reduce the cavitation risk on liquids, yet allowing to operate even with high pressure drops.
1-2400
Koso Parcol Double Eccentric Butterfly Valves
Eccentric disc, wafer body 3″up to 24″
up to ANSI 600#
1-2471 series eccentric disc valves provide superior flow control with an excellent shutoff against high pressure drops applied in either direction.
1-2480
Koso Parcol Anti-cavitation / Low Noise Butterfly Valves
Butterfly, flanged body8″ up to 80″
up to ANSI 150#CS, SS, Duplex SS
The 1-2480 series PARCOL flanged control valves have a double eccentric disc which reduces torque requirements and seal ring wear by minimizing its contact with the disc.
Additional torque reduction is obtained by the profiled drilled integral wings of the design 1-2483.
The drilled wings of 1-2483 make the valve suitable for flow control in cavitating services on liquids and for low noise flow control on compressible fluids.
Due to the eccentric design of the disc, these valves can provide a stable flow control with limited negative gradients and excellent shut-off in closed position.
Also the flow characteristic is improved and it is close to an equal percentage shape for low openings.
The reduction of flow coefficients due to the wings is balanced by higher values of factors FL, xT and xFZ which allow the use of this valves for high pressure drop and angular travel up to 80° on liquid and gas services.
For more critical service a special execution with extended wings and angular travel up to 100° is available.
Available with body in A216 WCB, AISI 316, AISI 316L, A890 4A duplex stainless steel and size upto 80 inches is widely used in desalination plants.
1-7000
Koso Parcol Tandem Plug Control Valves
Single port, straight way or angle
forged DN 1″ through 3″ ANSI flanged
Butt welding ANSI B16.25
PARCOL 1-7000 series control valves are especially designed for high pressure applications on high differential pressure water or steam condensate service
They are intended primarily for power plant installations where can be used for the most critical services such as high pressure steam line drain, continuous blow down, lines warm-up, cooling water stop or control for desuperheating systems.
Linear or angle type drop-forged steel body with peculiar design of bonnet assure an heavy, compact and reliable construction.
The particular design of trim with intermediate, cage guided, double plug, allows to separate sealing surfaces from the modulating ones, warranting, combined with an appropriate material selection, a perfect and reliable sealing.
A wide range of multi-step trim combinations make this valve suitable for modulating and on/off service with extremely high pressure drops where perfect and reliable seal is required.
Where erosion and cavitation is a problem, single or multiple concentric cages with special drilling are available.
1-7000 valves are usually equipped with Parcol 1-X-290 single or double diaphragm multi spring pneumatic actuators.
Other electric or hydraulic actuators can be provided on request.
Koso Parcol Limiphon 4-4000 Control Ball Valve
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Low noise with high capacity
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Thanks to Varistep Technology
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Customizable performances
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Thanks specific design of flow paths
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Extra Low Flow Control
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Thanks to first stage spherical micro-drilled control stage
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Repeatable class VI Shutoff
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Thanks to ball valve technology with independent control and sealing areas
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Dual Shutoff
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Bi-directional perfect seal shutoff
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Low Friction Torque
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Thanks to experienced selection of material and finishing
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Self-cleaning trim
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Thanks to growing trend of flow paths area
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