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Actuated Ball Valves
DAFRAM valves are suitable for manual operation by wrench or by gear when the force required at the wrench rim exceeds 300 N. Locking facility (API6D, 6.11) is available for both wrench and gear operators.
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Dafram Special Applications Ball Valves
SUBSEA APPLICATIONS
Subsea valves are designed according to API 6DSS to withstand external pressure corresponding to 3000 meters water depth. Special features are employed and different layout (fully welded body, split body, top-entry, soft/metal seats, triple barrier stem sealing etc). Valves can be hyperbarically tested according to Customer specifications. PR2 test certifications are available.
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In order to achieve the best surface protection by means of painting cycle, it is very important that painting first layer is applied immediatley after sand blasting. DAFRAM is equipped with a brand new blasting plant that is able to realize any kind of surface roughness (volume capacity m 3 x 3 x 5 and weight capacity up to kg 25.000).
After blasting, valves are loaded automatically into the painting plant that is able to apply any requested painting cycle according to Customer Specifications. Both blasting and painting process are continuosly monitored by skilled personnel.
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Dafram Top Entry Ball Valves
DAFRAM developed an advanced design of the top-entry ball valves in a complete wide range of diameters and pressure classes. Top-entry valves are the perfect choice when on line maintenance is required.
It is possible to remove the bonnet of the Top-entry valve allowing free access to the body cavity without dismantling the valve from the line. A set of special maintenance tools permits to take out both ball and seat-rings; this maintenance operation requires very little space around the valve, thus allowing it in areas where space is a limiting factor.
Top Entry construction is available in forged or cast execution, one piece symmetric body closed by a bolted bonnet. The range includes both Full and Reduced bore, pressure ANSI class from 150 to 2500 , with all possible combination of ENDS connections: flanged (RF-RTJ), butt welding and HUB ends.
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Dafram HIPPS Ball Valves
HIPPS (High Integrity Pressure Protection System) is an independently instrumented system that prevents plant lines from loss of containment due to over-pressure situations. DAFRAM valves for HIPPS applications are specifically designed in order to meet very strict requirements given by International Standards and service conditions.
Special attention is dedicated to valve drive train design and seat materials selection because of the considerable speed of shut down operation. HIPPS equipped with DAFRAM valves prove to be very reliable and are classified up to SIL 4.
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Dafram Twin ball DBB Valves
When assured valve shut off and absolute isolation are required, DAFRAM provides Double Block and Bleed valves that consist of two main in-line isolation valves and a bleed valve, used to drain or vent trapped fluid between the two obturators. This design guarantees great reliability of the system together with remarkable space and weight saving.
Various bleed valve options, end configurations and parts materials are available in order to meet service conditions and Customers' particular requirements.
Download DAFRAM Twin Ball Double Block and Bleed valves Catalogue
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Dafram Multiport Selector Valves (MVS) & Production skids
With the Multiport Selector Valve it is possible to receive the flow from five or more oil or gas wells. It consists in one steel body with five or more incoming flow lines or inlet-ports and two outlet-ports. One of the outlets (the bigger) collects and pipes oil or gas to production and the other one (the smaller) collects and pipes to test the fluids coming from the selected well. Various sizes and ratings of line flanges available.
Read more: Multiport Selector Valves (MVS) & Production skids
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Dafram Cryogenic Ball Valves
DAFRAM ball valves for cryogenic applications are available in floating or trunnion mounted ball and in side-entry or top-entry body design. Seat design and gasket materials are designed and selected in order to meet the most demanding requirements of leak rate and fugitive emission. New valve design and components are validated by R&D Department.
Helium and Nitrogen cryogenic tests are performed internally in special test rigs boxes for valves up to 36” size.
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Dafram Subsea Ball Valves
DAFRAM subsea ball valves are available in different construction versions: bolted-body side-entry or top-entry and fully welded body. As a standard, valve design, materials and testing are according to API 6DSS but the most demanding Customer specifications can be met upon request. Hyperbaric test is also available at DAFRAM Testing Department both for static and functional procedures.
Qualification tests according to TOTAL specifications and API PR2 have been successfully completed and witnessed by DNV on side-entry ball valves for 3000m design water-depth.
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Dafram High pressure service Valves
DAFRAM ball valves for high pressure service are available in different construction versions: bolted-body side-entry or top-entry with forged body for higher pressure ratings. Available quality control level is up to PSL 4 and performance requirements and tests are available up to PR2.
Advanced design tools and internal testing facilities are employed to reach the most demanding Customer specifications.
Special valves for HIPPS application are also available together with operation devices.
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Remote Valve Diagnosis (RVD) is a new proprietary system that monitors, acquires, registers and transmits critical ball valve performance information back to the maintenance personnel. The purpose of RVD is to provide real time condition information from a valve within any location, providing an alarm in the case of malfunction.
The main feature of RVD system is to provide affordable information about the tightness of the ball valve in real time. A patent pending algorithm continuously monitors pressures from the separate sections of a trunnion ball valve (upstream side, downstream side and body cavity) and compares the trend of these values with the pre-installed data for trends expected of a valve in good working conditions. If a tightness change is detected the system provides an alarm to the operator, who can decide on how to best plan preventative maintenance on the valve. The leak test can be performed also with valve in the open position. The pressure type of sensors can be selected to comply with your process system specifications.
| RVD BENEFITS | |
|---|---|
| Remote Valve Diagnosis | |
| Parameters real time analysis | RVD remotely provides and transmits information about the valve’s working condition without the intervention of the operator |
| Extremely sensitive leak detection system | A patent pending algorithm detects the presence of very small leakages, both in-line and to the ambient |
| Reduced maintenance costs | The valve status monitoring allows to plan preventative maintenance only when actually necessary |
| Accurate obturator position measurement | RVD is able to measure the obturator position directly from the ball, independently from the drive chain torsional deformations and gaps |
| Reduced plant downtime | The maintenance optimization reduces time waste |
| Enhanced safety | The ambient leakage remote detection deletes the risk of injury to operators |
| Increased plant efficiency | RVD features improves the overall plant efficiency in terms of reliability, safety and system management |
The RVD system also collects positional information for the obturator (Ball) by means of a high resolution encoder and three limit switches, two for the open and closed position and one for the partial-stroke test. This solution overcomes the inherent problems with traditional position measuring methods, RVD takes the angular signal directly from the obturator and not from the actuator. In this way the operator can be assured of the exact position of the obturator within the pipe bore, independently from mechanical gaps and torsional deformation of the drive chain. The RVD data and actuator data can be compared indicating any torque drive issues before the transmission linkage fails.
Another feature of this design is the flexibility it offers for the inclusion of additional sensors, such as thermocouples to monitor the fluid temperature. Other ports are also available including additional types of process monitoring sensors, such as gyroscopes, ac-celerometers and microphones to detect shocks, excessive vibrations and cavitation. RVD provides our customers with the most advanced and accurate live monitoring system for all those applications in which the valve integrity is a primary requirement for the plant. RVD is highly recommended for critical valve applications such as isolation, emergency shut-down, HIPPS and other similar critical applications.
RVD system is equipped with an internal memory and a long-life battery that ensure continuous measurement and storage operation. In the case of valve malfunction, RVD can send out an alarm. The communication from RVD to the operator can follow the most usual standards in the Oil&Gas industry, such as HART, MODBUS, PROFIBUS, FIELDBUS, etc. Bluetooth, USB and Ethernet communication modules can be also used to run a proprietary software that monitors the valve status in real time.
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DESIGN CHANGES
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