Monthly Archives: May 2018

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:

 

 

Pneumatic diaphragm lined-f46 globe valve

Lined valve for severely corrosive or toxic process fluids. An economic alternative to alloy bodies. Limited in pressure and temperature .

Fully lined, single-seated, unbalanced globe valve Integral bellows stem seal .

Valve Plug and Seat Ring: Pure modified (reinforced) PTFE Bellows: Heavy-duty PTFE (TFM1705) with 304L SST support rings [Bellows is PTFE for NPS 1/2 and 3/4 valves]

Equal percentage Maximum Cv from 0.212 to 145

Manual Gearbox

These (MQ)gearboxes are well suited for applications in petrol chemical, power, waterworks, HVAC and most general industrial applications.

The MQ series quarter-turn gearbox are rugged,industrial grade products manufactured with SG iron housing components.All models in this series are coated by a high grade paint or powder coating.These gearbox are well suited for applications in petrol . chemical,power,waterworks,HVAC and most general industrial applications.

MQ series gearbox are quarter-turn devices intended for the operation of ball,plug and butterfly valves as well as power and process dampers. The handwheel are available in a variety of sizes for easy operation.

Feature:

  •  Ductile iron gearcase
  • Black Electrophoresis coated shaft(Manganese black phosphating/Stainless steel shaft optional)
  • 12 models to 35000Nm output
  • Stroke 0-90︒(+/_ 5︒ adjustable at open or close position)
  • PTFE steel-backed thrust washers

Options

  • Pad-lockable
  • Limit switches
  • Operated temperature: High(200︒C)/Low(-60︒C)
  • Stainless steel fasteners
  • Powder coating

Environmental specification
Standard Enclosure:
A type sealed to IP68 for standard environment.
Enclosure options:

  •  TS type sealed to IP68 for submerged applications up to depth 1 meter for 72 hours according to EN60529:1991/14.2.8
  • CS type suitable for continuous submerged duty up to a maximum depth of 10 meters
  • B type sealed to IP68 for buried service applications

technical data:

sheet data

Gearbox size and weight