Flowserve V901 User Manual

VARICOOL - V901

Injection Nozzle Valve

Fig. 1

List of contents

1.1

1.2

1.3

1.4

1.5

1.6

1.7

6.1

6.2

6.3

6.4

6.5

6.6

6.7

Operating instructions

Installation

Delivery status

Installation recommendation

Physical requirements

System requirements

Preparation for installation in the pipeline

Installation of the SCHMIDT valve

Commissioning

Maintenance

Trouble shooting

Repair

Assembly

Cleaning

Lubrication

Assembly component „Nozzle Body“

Assembly component „Plug“

Assembly component „Packing“

Assembly „VariCool“

Assembly „Finish“

Parts list

7 + 8

Application

Injection control valve for direct steam cooling applications. In combination with a SCHMIDT multispring or central spring pneumatic actuator, optionally also with an electrical linear or rotary actuator, can be controlled. Suitable for a wide range of applications due to simple design and adaptability to different processes.

1 VARICOOL operating instructions

1.1 Installation

The device may only be assembled and put into service by qualified personnel. Qualified personnel are persons who are familiar with the assembly, commissioning and operation of this product and have the respective qualifications to perform these activities.

1.2 Delivery status

The SCHMIDT injection nozzle valves are delivered with assembled and calibrated actuators. They are provided with a protective coating, any shiny parts are greased and the body openings are provided with blanking plugs. The greatest care must be taken against knocks or sudden movements during loading and transport, as the lifting appliances must be attached without pressure on the stem and the position indicator by means of a rope sling below the actuator mounting flange. Any damage of the corrosion protection during transport must be remedied immediately. At the construction site, the injection nozzle valves must be protected against the effects of weather, grime and other damaging influences by being placed on a firm base in a closed room until required for installation. The blanking plugs attached for protection of the flange and interior of the control valve may only be removed at the installation site.

1.3 Installation recommendation

The successful employment of the injection nozzle valve depends directly on a suitable design of the converting station. As the function of the converting station depends greatly on the consideration of the physical possibilities, it is recommended to observe the stated standard values. Deviations may lead to considerable fluctuations in the control loop for which the nozzle valve manufacturer rejects any liability whatsoever. In borderline cases, an expensive conversion of the steam converting station should be expected. Even though the complex physical processes may in individual cases justify a deviation from the standard values, this requires, however comprehensive system knowledge and the express approval of the manufacturer.

1.4 Physical requirements

• For an optimal operation, the steam speed should be 10 to 100 m/s / 30 to 300 ft/s

• To avoid condensate the set temperature should be 5 to 10 °C / 41 to 50 °F above the saturated steam temperature.

• Max. operating temperature 530 °C / 986 °F

• Recommended cooling media temperature 120 °C / 248 °F

• Cooling media pressure 5 to 10 bar / 76 to 145 psi (see nozzle table) up to max. 90 bar / 1300 psi above steam pressure.

• We recommend the installation of a strainer into the cooling media pipe (mesh size 0,1mm / 0.004 inch)

• Minimum steam pipe diameter 150 mm / 6 inch

• Recommended straight pipe after injection nozzle valve: 0,1 x steam speed min. 4 to 6 m / 13 to 20 ft

• The distance of the temperature sensor should be 0,2 x steam speed or min. 9 m / 30 ft

• The position of the temperature sensor is important for the measuring quality

Pay attention to the mounting instruction of the sensor supplier

1.5 System requirements

• System drawing with design recommendation Experience shows that deviations result in considerable problems. A stratification of temperature zones is a frequent phenomenon in large steam piping networks. We recommend the installation of 2 to 3 temperature sensors with average value calculation.

Ensure that the central nozzle and the atomisation cone correspond to the axis of the piping. The cooling medium must always be injected in the direction of flow of the medium !

1.6 Preparation for installation in the pipeline

The sealing and functional check as well as the quality assurance checks carried out in the factory ensure the version of the control valve fully corresponds with the version specified in the supply contract. The model number and data required for operating the valve and drive are noted on the nameplate. The achievable stroke can be read on the driving starting pillar/yoke.

Before the installation, the pipelines must be carefully cleaned.

1.7 Installation of the SCHMIDT valve

Checklist:

• Does the name plate agree with the operating data of the system?

Non-agreement can lead to considerable damage of the injection nozzle valves, for which the manufacturer accepts no liability !

• Is sufficient space available at the installation location for problem-free installation and removal?

• Have the pipelines been cleaned before the installation?

Carefully remove any foreign bodies !

• Has the control valve been depreserved and cleaned before installation?

• Does the direction arrow attached to the body agree with the direction of flow?

• Do any unallowed voltages occur during installation and operation of the control valve?

Perpendicularity of the flange required !

• Does the spacing of the pipe ends correspond to the overall valve length?

If the aforementioned points are fulfilled, the control valve can be inserted in the pipeline and screwed together with the connecting material ( seals, screws, nuts - provided by the builder). Afterwards, the piping of the drive with the plant air in pneumatic actuators or the wiring of the electrical actuators can be carried out according to the electrical block diagram located in the removable drive hood or in the drive manufacturer documentation.

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