Универсальный поворотный сегментный клапан 35002
Universal rotary segmented valve with eccentric plug, combining the best features of linear and rotary control devices and offering high flow capacity, cavitation resistance, as well as a wide range and precision of control.
The operating principle of control valves, on-off valves, on-off and control valves is based on the rotational movement of a plug, designed as a ball segment, relative to the eccentric axis of the body.
The segmented section of the plug is flexibly connected to a hub mounted on the shaft, allowing for slight axial displacement. This enables self-centering of the plug within the seat. A tight fit of the plug is achieved through elastic deformation. The seat, equipped with a sealing chamfer, is secured in the body by means of a threaded retainer.
A spring-diaphragm pneumatic actuator, featuring a corrugated diaphragm and a return spring, rotates a plug through a lever mounted on the shaft splines, within a 50° range. This type of actuator is a standard design. Depending on project requirements, other actuator types can be supplied.
The equipment can be applied within a wide range of operating temperatures.
Technical specifications
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Nominal diameter DN 25 to 300 mm
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Nominal pressure PN 1,6 to 10 MPa
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Operating temperature - 200 to 400 °С
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Flow capacity Сv 5,6…1750 / Kv 4,8…1505
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Flow characteristic linear / equal percentage
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Rangeability 100:1
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Seat leakage
class IV, V, VI according to GOST 9544-2015 / class А according to GOST 9544-2015
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Body material carbon steel / cold-resistant steel / stainless steel / corrosion-resistant alloys
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Packing material carbon+PTFE / graphite
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Connection flanged / wafer
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Actuator pneumatic spring-diaphragm / pneumatic piston / electric / manual
Execution options
For all sizes, from DN 25 to DN 300, complete elimination of leakage to atmosphere is achieved by the use of additional elastomeric O-rings, installed in addition to the standard gland packing. This design meets the environmental protection requirements of various countries. In many cases, this eliminates the need for expensive bellows seals.
Flanged valves are available with steam jacketing. The circulation of steam in the heating jacket enables Series 35002 valves to be used with crystallizing and polymerizing media.
Erosion of the body and trim is avoided by using a Venturi-shaped seat with Stellite overlay.
Hardfacing and special trim design for handling media containing solid inclusions. The trim can be manufactured from zirconium ceramics.
Bodies made of special alloys Uranus B6, or Hastelloy C for highly aggressive media, or bronze for oxygen applications. Materials compliant with NACE standard requirements for hydrogen sulfide-containing media.
By means of selective assembly and further lapping of the plug and seat, the 35002 series valve can be manufactured with a metal-to-metal seal, achieving seat leakage Class V, VI according to ANSI/FCI 70.2 or Class A according to GOST R 54808.
Very short response time without any loss of stability is achieved through the use of special positioners or booster relays.
Special design for operation at ambient temperatures up to -60 °C
Compatibility with electric actuators made by a wide range of manufacturers.
The 35002 series valve can be equipped with a fully enclosed manual gearbox. This design requires minimal effort on the handwheel and features a safety mechanism to prevent unintentional rotation due to vibration.
The 35002 series valve can be used as a reliable shut-off valve, allowing for tight and rapid pipeline closure. In this case the valve is equipped with limit switches, a three-way solenoid valve, or other required accessories. The standard actuator provides a travel time of less than 12 seconds. By modifying the sealing element, it is possible to meet the tightness requirements of Class A according to GOST R 54808.
Features
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PlugThe plug, typically made of Stellite (DN <80) or stainless steel with Stellite overlay, and the streamlined design of the valve body's flow path ensure erosion resistance.
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Self-aligningFlexible plug arm allows for its self-alignment in the valve seat.
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EnclosureThe actuator's moving components are completely enclosed.
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Field reversible designThe actuator can be reversed in the field (flow to open / flow to close) by rearranging actuator parts.
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Mounting optionsEight different mounting options for the valve actuator relative to the pipeline provide easy access and maintenance.
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High-precision connectionTight, high-precision splined connection of shaft to a plug and actuator lever.
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Standard backup O-ringsStandard backup O-rings on the packing follower
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Integral extension bonnetIntegral extension bonnet protects the packing gland from the process fluid temperature.
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High-accuracy controlInstallation of the positioner cam directly on the shaft end increases the accuracy of control
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Easy cam rearrangementThe possibility of changing the flow characteristic in the field due to a rearrangement of the positioner cam
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High-precision connectionTight, high-precision splined connection of shaft to a plug and actuator lever.