self-operadted

ZZVP series self-operated micro-pressure control valve

It is composed of actuator, regulating valve, pressure taking the pipe and other parts.

Self-operated micro-pressure control valve (referred to as micro-pressure-valve), is not required any external energy, using the energy of the medium to achieve automatic adjustment of the actuator products.This product USES the balanced single seat valve quick opening flow characteristic adjustment mechanism, the control medium pressure is stable, and the adjustment precision is high, used for the micro pressure control, the sealing performance is safe and reliable, during the movement may carry on the adjustment to the set value arbitrarily and so on the characteristic.Therefore, it is suitable for all kinds of industrial furnace combustion system fuel gas, oil in process or oil storage tank protection gas and heat treatment protection gas micro pressure automatic adjustment and so on.

The micro-pressure valve is mainly composed of two parts: the testing actuator and the regulating mechanism. Its structure and principle are shown in above figure.

The medium enters the valve body from the arrow direction and is output after throttling the valve core and seat. The other way enters the diaphragm chamber of the testing mechanism through the connecting pipe, and acts on the diaphragm to make the valve core displace correspondingly, so as to achieve the purpose of automatic flow control. If the output pressure rises, the force acting on the diaphragm increases, the compression spring drives the stem, which reduces the flow area between the seat and the spool until the pressure after the valve drops to the set value.

Similarly, when the output pressure decreases, the force acting on the diaphragm decreases. Because of the reaction force of the spring, the valve stem is pushed forward, so that the flow area between the seat and the spool increases until the pressure behind the valve rises to the set value, which can be achieved through the adjustment of the spring.

single-path multi-stage severe sevice control valve

Power Generation

Fossil and nuclear power plants, cogeneration (CHP) facilities and other industries handling high-pressure water or steam:
Reheat and superheat attemperator spray
Main and booster feedpump recirculation
Startup and main feedwater regulation
Deaerator-level control
Condensate booster pump recirculation
Atmospheric steam dump and steam venting
Turbine bypass
Turbine bypass spray
Sootblower control
Once-through boiler startup
(base-loaded and cycling units)
System startup: B&W, CE, FW and licensees
Auxiliary steam
Turbine seal pressure control
High-level heater drains
HP coolant injection (HPCI)
Reactor core isolation cooling (RCIC)
Core spray
Residual heat removal (RHR)
Steam generator blowdown
Pressurizer PORV
CVCS letdown
Sampling
Pump test loops

Oil, Gas and Petrochemical

Production, transmission and processing, including
LNG and petrochemicals:
Production chokes
Separator-level control
Gas lift/injection
Injection pump recycle
Overboard dump
Gas regulator
Surge relief
Gas injection/withdrawal
Metering stations (active/monitor)
Compressor recycle/anti-surge
Hot gas bypass
Emergency depressuring/gas to fl are
Amine letdown
Expander bypass (JT valve)
Vent to atmoshphere
Feedwater regulator
Feedwater pump recirculation
Spraywater
Steam header pressure control

Symptoms of Cavitation
1.Noise when liquid-handling valves modulate or shut off
2.Valve components showing “pitting” damage
3.Poor process control with the valve





Top-guided globe Control Valves

The serials include follow types: pneumatic diaphragm top-guided globe control valve、 electric top-guided globe control valve、top-guided  F46-lined globe control valve.

Actuator selection: Spring-and-diaphragm, Pneumatic piston, Electric motor, Electro-hydraulic.

constructor  compact,flow path is “S” style in body,low pressure differential, low resistence coefficient and wide rangeability,flow charactristic is accurate for process, strong guide for travel.

bonnet constructor :bellows seal type、steam-jacket type 、Extension Bonnet ,etc.

1.cage-guided

a.  cage-guided constructor,stronger guided due to seal performance & longevity.
b. Quick change trims allows for easy of maintenance,no internal components are screwed and welded into valve body
or bonnet. low cost of maintenance in plants.

2. approximate uniform section of  “S” mould
low resistence coefficient,wider rangeability
3.top guide F46-lined globe control valve
F46、PFA;anti-corrosion, lining material :F46 and PFA
4. steam-jacket type
heat the medium in the pipe.
5. Bonnet type
Bellow seal type (Pressed or Welded)
6.Characteristics
Equal percentage,Linear, On-off.
7. material comply with NACE MR0175
8.Rating: 150#、300#、400#、600#、900#

according with industry standard
IEC60534 industry process control valve standards
flange standards:ANSI B16.5/B16.25

Cage double-seat control valve

The series sleeve two-seater regulator (hereinafter referred to as the sleeve regulator) is a kind of pressure balance type regulator, compact structure, small volume, simple structure, the valve body fluid channels in an s-shaped streamlined, with a small pressure drop loss, large flow, wide adjustable range.High accuracy of flow characteristic curve, good dynamic stability, low noise, low cavitation corrosion, etc.Because the valve core adopts a fluid pressure balance structure, it only needs a small operating force to achieve stable adjustment.

This series of regulating valves are easy to be made into corrugated pipe seal, heat dissipation plate, extended upper valve cover and other special structures.

1、body  2、cage(drilled holes)  3、plug  4、gaskets  5、bonnet  6、nuts  7、bolts  8、spring gasket  9、packing spring  10、spring gasket  11、packing  12、nuts  13、bolts  14、gland  15、”O” ring  16、packing press  17、”O” ring

Body Size:20~400 mm(1/2″~16″)

Rating:  ANSI Class 150,300,600 lb

Double Eccentric Butterfly valve

Nominal diameter : DN50~ DN600
Flow characteristics:Equal percentage
Type of connection : Wafer
Nominal pressure:PN10,PN16,PN25,PN40,
ANSI Class 150LB,Class300 lb;
Flange standard:ANSI B16.5
Face to Face:ANSI B16.10

 

 

 

 

 

Double eccentric butterfly valve has been improved based on single eccentric butterfly valve.Its structure characteristics is that the axis of the stem not only deviates from the disc,but also deviates from the ontology center.With this double eccentric design,butterfly disc can quickly separated from the seat,which greatly eliminated the unnecessary excessive extrusion and scratches.It can reduce the resistance and wear once open,and improve the lifetime of the seat. Metal seat
can also be acceptable and will expand the application field in high temperature condition.

[pdf-embedder url=”https://www.ctrvalve.com/wp-content/uploads/2018/08/high-performance-double-eccentric-butterfly-valve.pdf” title=”high performance double eccentric butterfly valve”]

multi-path and multi-stages control valve

The Series BL108 valves are engineered specifically for critical anti-cavitation and low noise applications on liquids,gases or steam. Multi-stage cage controls flowing velocities in the valve trim by forcing the process fluid to follow a tortuous path of right-angle turns. The resistance to flow provided by these turns reduces fluid velocities significantly. Therefore, a vena  contracta is never formed in the trim and noise and cavitation are stopped before they can start.

Feature:
1.Special sleeve with multi-hole, single-layer or with multi-hole, multi-layer design to control flow
2.Applicable to smaller pressure differential and higher flow rate
3.Valve trim capable of quick disassembly
4.Easy maintenance and replacement
5.Stellite material overlaid on areas subject to washing
6.Multi-ring grooves reducing pressure design
7.High temp resistance, flashing resistance, anti-cavitation

Specification:
Technical Data:
Rating: ANSI Class 300、 600、900、1500、 2500、4500
Nominal Size: 20-400mm
Plug form:Pressure balanced plug type
Characteristics: Linear , Modified Linear , Modified EQ%
Inlet/Outlet Connection: flanged or butt-welded
Actuator: motorized, pneumatic or other

Self-operated pressure control valve series

Feature

ZZYP self-operated pressure regulator adopts the external pressure extraction structure, which can automatically adjust and stabilize pressure depending on the pressure change of the medium itself. It has the characteristics of simple structure and reliable movement.Using balanced bellows valve core structure, has the unbalanced force is small, nimble, widely used in all kinds of low viscosity liquid, gas and steam, is a kind of applied in the use of energy-saving products without gas and electricity;

ZZVP self-reliance declined pressure regulating valve with external pressure and internal pressure of two kinds of structure, can rely on the media’s own pressure changes to achieve the purpose of automatic adjustment and stable pressure, has the characteristics of simple structure, reliable action;Suitable for various non-corrosive gas pressure relief or pressure relief stable occasions;

ZZCP self-reliance type differential pressure regulating valve outside using pressure structure, can rely on the media itself before and after the valve to automatically adjust the pressure change and stability of the pressure difference, the purpose of has the characteristics of simple structure, reliable action;Applicable to all kinds of differential pressure regulating the corrosive gas and low viscosity liquid.

ZZYPII operational command device self-reliance type pressure regulating valve by valve (the main valve), actuators, command device of three parts, can rely on the pressure change of modulated medium itself to achieve the purpose of automatic adjustment and stable pressure, decompression of the large pressure difference voltage or pressure regulator.

ZZDG type nitrogen seal regulating valve has two kinds of nitrogen supply regulation and nitrogen release regulation, which can depend on the pressure change of the regulated medium itself to achieve the purpose of automatic regulation and stable pressure.Is mainly used to keep the container at the top of the shielding gas (usually nitrogen) pressure constant, so as to avoid direct contact with the air container material, prevent evaporation materials, oxidation, and the safety of the vessel;This series of nitrogen sealing device is especially suitable for the gas seal protection system of all kinds of large storage tanks.It can be divided into two types: nitrogen relief type (K type) and nitrogen supply type (B type).

The series of regulating valves are divided into two types: control valve front (type K) and control valve back (type B).

Key feature

  • The regulator is with commander control,it has high control accuracy,and control easily
  • Excellent dynamic control performance and static shut-off ability.it can widely used in all kinds of micro-pressure N2 seal system and gas regulator supply system.
  • The lever’s force control makes the control accuracy and stable,and the work only need 0.03Mpa inlet pressure
  • The regulator is equipped with output pressure gauge,it makes the installation very easy on site.

Normal Pressure: ANSI 150
Adjusting pressure setting range KPa:0.2~0.6;0.5~1.2;1~4;3~15
Control accuracy:2%
Shut-off ability:10%
air and other gases
Operating temperature:-40~60℃
Leakage level:VI
Feedback connection:with 10 coupler connection

Pressure Reduction and Desuperheaters

Reduce pressure and Desuperheaters system

feedwater control valve(control feed water flow rate to desuperheater)

according to process conditions selection feed water control valves.

Desuperheaters:

sizes:2″~16″
ANSI Class 150 to 2500
fabricated and forged constructions
High quality stuffing box
Variable nozzle type
Wide range of Cv(Kv) capacities available
Special nozzle combinations available

Application data

  • Boiler superheaters
  • Boiler reheaters
  • Turbine bleed steam
  • Pressure reducing valve outlet steam
  • Process steam
  • process gas

Every desuperheating station is a mixing point where there is a heat and mass balance. the universal formula is:

Gw=Gst(h1-h2)/(h2-hw)
where:
Gw—Injection water mass
Gst—Inlet steam mass
h1—Enthalpy of inlet steam
h2—Enthalpy of the outlet steam
hw—-Enthalpy of the injection water

This formula enables calculation of the quantity of water required to lower the inlet steam temperature to the the set-point temperature of the outlet steam.

Apart from the spray quality of the atomizer(primary atomization)there are other system parameters which influence the desuperhearter stations performance.These are:

Inlet steam velocity

At high steam velocities, water droplets are easily disintegrated.This factor contributes to the overall atomization quality(secondary atomization). The minimum acceptable steam velocity varies as a function of the nozzle size and pipe diameter.In case of doubt,  consult Proactive control valve team.

Water to steam ratio

This ratio is determined by dividing Gw by Gst. For system steam pressures below 15 bar,this ratio should nor exceed 10% for the normal operating conditions.system operating between 15 to 25 bar can have a ratio of up to 15%. For higher pressure duties , consult Proactive control valve team.

Distance to sensor

The distance from the injection point to the temperature sensor should be 12 to 15 meters. Systems operating at pressures above 25 bar can have significantly less run to the sensor.consult Proactive control valve team.

Required straight pipe run

The distance from injection point to the first pipe bend is also a function of steam pressure,temperature and nozzle size. Experience has shown that in systems up to 25 bar,4 to 6 meters is acceptable distance.

Spring back pressure nozzle

Desuperheater may be equipped with a variety of spray heads.The uniform body welding accepts spray cylinder heads with a wide range of Kv(Cv) values.Standard configurations are with either 3 or 6 equally sized spray nozzle but combinations are available.this feature enables Desuperheater to be customized to specific system requirements.

Feature

  • high Rangeability:200:1
  • pressure adjustment range:1.5-8 bar
  • no droplet form
  • Fan-shaped surface out
  • Misty,Average size of water droplet:60um
  • anti-cavitation
  • Anti-blocking, self cleaning
  • no need for check valve

Reduce pressure: