PV-ECO: The Chemical Tanker P/V Valve
The PV-ECO is designed for use on Chemical Carriers and Product Carriers addressing the special requirements for P/V valves. The PV-ECO offers:
- Superior performance to keep costs of the venting system down.
- Configurability to match the requirements of the yards and owners.
- Low cargo emissions to reduce loss of cargo during transit.
- Approval to work for long pipes, increasing the flexibility in the piping design for the yard.
- Simplified maintenance, reducing disassembly time by 60 %.
- Lower number of parts, lowering the maintenance cost.
Safety
- The PV-ECO valve is designed, tested and manufactured to provide maximum safety for crew, cargo and vessel.
- The pressure unit has been designed to ensure that the efflux velocity is always above the required minimum of 30 m/s and typically between 60-100 m/s.
- The cone of the pressure unit has been optimized to secure vertical vapour dispersing, which combined with the high efflux velocity ensures, that gas is safely led away from the deck.
- The PV-ECO valve has been extensively fire tested at the world’s leading test laboratory in Germany. Tests include endurance burn testing and flash-back testing under all relevant rules.
- The resilient seal protects against leakage and reduces emissions to virtually zero.
Pres-Vac is ISO 9001 certified to ensure consistency of the high-quality products that Pres-Vac is known for.
Compliance with rules and regulations
- The PV-ECO valve is designed, tested and manufactured to comply with all existing and foreseen international regulations.
- In 2013 the European Commission adopted EN ISO 16852:2010 as a new standard foR testing of flame arrestors to be installed onboard marine vessels. As the first P/V valve on the market, The PV-ECO valve has been designed, tested and approved to comply with this new standard.
Flashback testing at low flow rates following EN ISO 16852:2010. The flashback tests shall be performed on pipe lengths equal to or longer than the pipe length, on which the valves are to be installed. This is mandatory according to EN ISO 16852:2010.
Effective relief of tank pressure
The PV-ECO valve provides effective control and management of the tank pressure. If the pressure exceeds the specified opening pressure, the valve will open immediately and relieve the excess pressure. Similarly, if pressure during discharging gets below the specified opening pressure, the valve will open and relieve the vacuum. The PV-ECO valve has an advanced flow control design to manage tank pressure:
- The tank pressure valve is controlled by a combination of magnet and weight forces to secure that the valve does not create a pressure surge during the opening.
- A patented combination of a booster plate and pressure control ring secures that the valve has a soft opening and closing phase securing efficient operations also at low flow rates.
- A patented, integrated dampener secures that the valve can operate non-hammering and non-oscillating also at long pipe lengths.
High closing pressure
The patented new flow control system secures that the PV-ECO valve has a very high closing pressure reducing blowdown to 5-6 kPa. This means substantial reductions in loss of inert gas and cargo vapour compared to other P/V valves.
Low noise level
The PV-ECO valve is designed to minimise noise during operations. By optimising the nozzle design, the noise level of the PV-ECO valve has been reduced by 10-15 dB compared to other designs. In many applications, hearing protection will not be required.
Additional features
The PV-ECO valve has been made easier to maintain by the following features:
- The number of parts has been reduced by 30 % and the valve is very simple to disassemble and maintain.
- The weight of the valve has been significantly reduced.
- Check lift can be maintained without disassembly of the valve.
- Easy calibration of setting after over-haul
- Regular maintenance can be performed by onboard crew.
- Replaceable vacuum flame arrestor and replaceable gas freeing cover screen arrestor
- The integrated resilient seat can be replaced and reduces disc/seat wearing to zero.
Configured to your requirement
Pres-Vac P/V valves are individually configured to suit your specific requirements:
- 9 different sizes of pressure units combined with 7 different sizes of vacuum units
- Variable flange size
- All flange standards available
- Optional integrated gas freeing cover
- Options include electric heating, coating and high-pressure dual valves
- Two different product versions
Operations and maintenance made simple
The PV-ECO valve has been designed to simplify operation and maintenance. Daily operations by the crew are made simple by the following features:
- New two-way operating full stroke check lift
- Visual inspection of all moving parts
- Dirt indicator
- Hinged type gas freeing cover
Option: Electric, steam or thermal heating
- The pressure unit and the vacuum unit can be equipped with a heating device. This prevents ice accretion*, which will result in malfunction. The heating will also prevent certain cargoes with a high pour point from crystallising, as the temperature can be kept at a suitable level.
* Ice accretion occurs when waves or heavy rain is present with surface temperatures at or below freezing. A layer of ice will accumulate and prevent the valve from functioning properly.
Option: Custom coating
- As a standard, the PV-ECO is delivered in stainless steel without coating. However, it is possible to deliver the PV-ECO valve in any colour.
Option: High-pressure dual valve
- The valves can be delivered with a high-pressure unit for special chemical applications or high pressure requirements to reduce vapour emissions. The valves can be adjusted for specific needs.
The PV-ECO valve is available in two different versions:
PV-ECO ULTIMATE
You should choose a PV-ECO Ultimate if you are particularly concerned about leakage protection, loss of inert gas, disc/seat and flame screen maintenance costs.
The PV-ECO Ultimate delivers all the features of the PV-ECO Superior and three additional safety and maintenance features:
- Seat with integrated resilient seal.
- The integrated resilient seal provides ultimate leakage protection and also reduces wearing of disc and seat.
- Flame screens in AISI 316 L stainless steel.
- To reduce wear from high corrosive cargoes and to extend maintenance intervals, flame screens are delivered in AISI 316 L stainless steel.
PV-ECO SUPERIOR
You should choose the PV-ECO Superior if your focus is to get a safe and very reliable P/V valve of high quality.
Main features:
- Optimal safety
- Compliance with all current rules and regulations Low noise
- Low blowdown
- Simple operations and maintenance
Resilient seal
- Elimination of leakage
- Reduction of wear and tear
- Easy replacement
- Made of advanced, non-flammable material.
- Suitable for chemical and oil products
