PEROLO MEGA SUPERVENTIX Flanged SRV 2.5″ DN65, 3.75 / 0.21 bar Vacuum

The Flanged Safety Relief Valve, 2.5 inch (DN65), MEGA SUPERVENTIX model, made by PEROLO in France, is designed to fit liquid and chemical tanks such as ISO Tanks, Rail Tanks, Road Tankers and IBCs, protecting the tank from Overpressure and Excessive Vacuum.

Unlike the BSP threaded model, it mounts with a flange that has 4 slotted holes, Ø18 mm, on a PCD of 145 to 152.4 mm, so it fits directly onto the tank's flange seat and is fixed with 4 M16 screws.

• Dual Protection: Relieves overpressure at 3.75 Bar and lets air in at a vacuum of 0.21 Bar, in a single valve.
• Precise mechanism: The Pressure Plate lifts up to 20 mm to open the full relief area in an emergency or fire.
• Premium materials: Stainless Steel 316 / 1.4408 body, resistant to corrosion from industrial chemicals

• Product name / model: DN65 Flanged MEGA SUPERVENTIX (MX65S/P or MP65S/P PED)
• Nominal Diameter: 65 mm or 2.5 inch (ND65)
• Set Pressure: 3.75 Bar g (375 kPa / 54.4 psi g)
• Vacuum Setting: 0.21 Bar (210 mBar)
• Connection: Flange with 4 slotted holes, Ø18 mm, on PCD 145 to 152.4 mm
• Certified Flow Rate: 3.15 Sm³/s (6,666 Scfm) at 110% of Set Pressure (without Gauze)
• Body material: Stainless Steel 316 / 1.4408
• Setting Gasket / O-ring: PTFE / FEP Silicone
• Working Temperature: -50°C to +190°C (temperature range may vary with seal material) | High Temperature model up to +220°C
• Model Pressure Setting range: 0.5 to 7.4 Bar (maximum 4.4 Bar for PED) | Vacuum Setting range: 50 to 410 mBar
• Weight: 5 kg
• Flow reduction with Flame Proof Gauze fitted: less than 12%

Valve dimensions

• Overall height: 111 mm | Top cover diameter: Ø117 mm
• Bottom flange diameter: Ø190 mm | Internal passage: Ø70 mm

Note on material: Some sources list the product as 316L, but the Specification document states the body material as 316 / 1.4408, so check the Material Certificate and the markings on the actual valve lot before citing 316L.

The flanged model code starts with MX65 (standard) or MP65 (PED), followed by the Body Drilling option:

• S Flange with 4 slots, Ø18, on PCD 145 to 152.4, with a 1/4″ BSP port
• P Same as S, but supplied with a Plug in the port

Then the Pressure Setting (37 = 3.75 Bar), O-ring material (T = FEP/Silicone, H = PFA High Temp), Vacuum Setting (21 = 0.21 Bar), Flame Proof Gauze (G/S), Vacuum Test Button, Halar Coating and Gauge Protection.

Always confirm the Full Part Number from the Nameplate, Certificate or order documents before publishing the code on the website or ordering parts.

Designed to comply with ADR, IMDG, RID and ISO 4126-1 §7.3, with Design Approval from DNV-RMR

Model MP65S/P is certified to PED 2014/68/EU (Category IV, Module H1, Fluid Group 1, Notified Body: DNV) and covers Set Pressures up to 4.4 Bar, so the 3.75 Bar setting is within the PED model range. Confirm that the actual product is an MP code with a Certificate matching the Serial Number.

Suited to ISO Tank Containers, Road Tankers, Rail Tank Cars, IBCs and static pressure tanks with a flanged valve seat on PCD 145 to 152.4 mm, specified for a Set Pressure of 3.75 Bar with Vacuum 0.21 Bar.

Before use, check that the Set Pressure matches the tank MAWP (the manufacturer recommends 1.1 times MAWP) and that the valve, seal and gasket materials are compatible with the product carried.

1. Check that the seat flange and valve flange are clean and free of dust or debris.
2. Place the Setting Gasket or Bursting Disc in line with the holes.
3. Caution: the Bursting Disc for the flanged model must be 3 inch (ND80) only, even though the valve itself is DN65.
4. Place the valve on the flange and fit all 4 M16 screws.
5. Tighten in a cross pattern (Cross Type) to a torque of 70 N·m ±5 N·m
6. Check for leaks at the gasket or Bursting Disc after fitting.
7. Do not cut the Wire Weld Seal between the Body and Cover before the inspection interval, otherwise the warranty ends immediately.

• Weld-in Flange (12 92 03 00 00): Outer 190 mm / inner Ø82 mm / thickness 26 mm / 316L / 4 × M16 on PCD145
• Recess Flange (11 90 63 00 00): Outer 217 mm / inner Ø82.6 mm / thickness 31 to 65 mm / 316L / 4 × M16 on PCD145
• Setting Gasket (12 92 04 00 00): CNAF/PTFE flat round Ø176 × Ø82 mm, drilled 4 × Ø18 on PCD145
• Screw Kit (11 10 09 91 00): 4 M16-40 screws with 4 Grower Washers
• Stud Kit (17 12 12 91 00) For stud mounting
• Bursting Disc 3″ ND80 4.84 Bar (DRS80P484T20)
• Pressure Gauge (70 18 06 00 95 / 70 21 02 00 22): 1/4″ BSP bottom outlet, stainless steel body

Matching Spring Set

• Pressure Spring Set 3.75 Bar: 11 10 01 96 00
• Vacuum Spring Set 0.21 Bar: 11 10 01 98 00

Pressure and Vacuum Seals

• Pressure & Vacuum O-ring Kit: 11 10 01 91 00
• Pressure O-ring FEP/Silicone: 11 10 01 99 05 | set of 10: 11 10 01 99 06
• Vacuum O-ring set of 10: 11 10 17 99 00

Other parts

• Pressure/Vacuum Plate: 11 10 01 99 00 | Vacuum Poppet: 11 10 01 99 02 | Vacuum Set Kit: 11 10 01 99 08
• Flame Proof Gauze Kit (flanged model): 11 10 01 94 00 (a different code from the threaded model)
• Adjustment Nut: 11 10 02 99 06

The manufacturer recommends removing the valve for inspection and seal replacement in a Workshop about every 2 years. The internal spring set holds 100 to 400 daN of preload, so removing the Cap must be done carefully by a specialist with the right tools.

After replacing seals or the Spring Set, the valve must be set on a Test Rig with a Class 0.5 Manometer: find the opening point, adjust the Set Pressure to exactly 3.75 Bar, then seal the Cap with Stainless Steel Wire. Use only PEROLO OEM parts, otherwise the warranty ends.

Gavan Asia supplies the genuine PEROLO flanged safety relief valve, DN65, set at Pressure 3.75 Bar and Vacuum 0.21 Bar, with the full range of OEM parts: matching Spring Set, O-ring Kit, CNAF/PTFE Setting Gasket, Screw Kit and 3″ ND80 Bursting Disc.

If your tank uses a 2½” BSP threaded seat, we recommend the Threaded SRV 3.75 Bar instead. Before ordering, please send the Full Part Number, Serial Number, PED Requirement and the Body Drilling code (S or P) so we can confirm the right model. For prices, stock and technical information, contact Gavan Asia today.