PEROLO MEGA SUPERVENTIX SRV 2.5″ BSP DN65, 4.4 bar / 0.21 bar Vacuum

The 4.4 Bar safety relief valve, MEGA SUPERVENTIX 2.5″ SRV, is a Pressure and Vacuum Safety Relief Valve made by PEROLO in France. It is available as MX65F (standard) and MP65F (PED) to protect tanks from overpressure and excessive vacuum.

The valve has a 2½ inch (DN65) bore and connects to the tank with a 2½” BSP thread, with relief settings of:

• Pressure Setting: 440 kPa or 4.4 Bar
• Vacuum Setting: 21 kPa or 0.21 Bar

When tank pressure reaches 4.4 Bar, the Pressure Plate opens to release gas or vapour quickly and closes again automatically when pressure balances. The Vacuum Relief opens to let air into the tank at a negative pressure of 0.21 Bar to prevent the tank from collapsing.

The key point of this model is that 4.4 Bar is the highest setting covered by PED certification and is the factory standard configuration, so it suits tanks that use the full design pressure range.

Overpressure relief

Pressure inside the tank acts on the Pressure Plate, which is held down by the spring set. When pressure reaches the 4.4 Bar Set Pressure, it overcomes the spring force and the valve plate lifts to open the relief area.

If pressure rises quickly, the Pressure Plate can travel about 23 mm to open a larger flow path. Once pressure drops, the valve returns to the closed position automatically.

Vacuum protection

When pressure inside the tank drops to 0.21 Bar, the Vacuum Poppet opens to let air into the tank, balancing the pressure and reducing the risk of the tank deforming under vacuum.

• Manufacturer: PEROLO (France)
• Standard model: MX65F | PED model: MP65F
• Nominal Diameter: DN65 or 2½ inch
• Body Connection: 2½” BSP Threaded
• Pressure Setting: 440 kPa / 4.4 Bar
• Vacuum Setting: 21 kPa / 0.21 Bar / 210 mBar
• Weight: 3 kg
• Valve body material: Stainless Steel 316 / 1.4408
• O-ring: FEP/Silicone | Setting Gasket: PTFE/FEP as per Codification
• Working Temperature: -50°C to +190°C (temperature range may vary with seal material) | HT model up to +250°C
• Model Pressure Setting range: 0.5 to 7.3 Bar (maximum 4.4 Bar for PED) | Vacuum Setting range: 50 to 410 mBar

Flow at 4.4 Bar Set Pressure (per Specification Sheet)

• Measured Flow at 110% of Set Pressure (without Gauze): 4.07 Sm³/s or 8,622 Scfm
• Certified Flow 90% at 110%: 3.66 Sm³/s or 7,760 Scfm
• Measured Flow at 120%: 4.41 Sm³/s or 9,344 Scfm
• Measurement conditions: 101.3 kPa at 15°C | Flow reduction with Gauze fitted: less than 3%

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.

This spec matches the factory standard code MX65F44T21GC where the code means:

• MX65 Standard model (choose MP65 for PED)
• F 2½” BSP Connection
• 44 Pressure Setting 4.4 Bar
• T FEP Setting Seal
• 21 Vacuum Setting 0.21 Bar
• G With Flame Proof Gauze
• C Composite/PTFE Setting Gasket
• The last positions depend on the Vacuum Test Button and Halar Coating

If PED certification is required, choose model MP65F, which covers Set Pressures up to 4.4 Bar, exactly matching this model. Confirm the Full Part Number from the Nameplate, Certificate or order documents before publishing the code on the website.

MEGA SUPERVENTIX is designed to comply with ADR, IMDG, RID and ISO 4126-1 §7.3, with Design Approval from DNV and RMR.

Model MP65F is certified to PED 2014/68/EU (Category IV, Module H1, Fluid Group 1, Notified Body: DNV), and 4.4 Bar is the maximum setting for the PED model. Confirm that the actual product is an MP65F with a Certificate matching the Serial Number.

• Protects against both overpressure and vacuum in a single valve
• Set at 4.4 Bar, the highest pressure covered by PED certification
• Factory standard configuration (MX65F44T21GC), the easiest in the range to source parts for
• High flow of up to 4.07 Sm³/s at 110% of Set Pressure
• 2½” BSP threaded connection, compact design, only 3 kg
• Available as MX65F (standard) and MP65F (PED)
• Temperature range -50°C to +190°C, HT model up to +250°C
• A matching 4.84 Bar Bursting Disc is available for fitting together

Suited to ISO Tank Containers, Road Tankers, Rail Tank Cars, IBCs and Static Pressure Tanks, including tanks carrying liquid chemicals and liquid food products specified for a Set Pressure of 4.4 Bar and Vacuum 0.21 Bar.

Before use, check that the Set Pressure matches the tank MAWP and that the valve body, O-ring and Gasket materials are safe to use with the product carried.

1. Check that the valve Set Pressure matches the tank MAWP.
2. Check Material Compatibility between the valve and the product carried.
3. Install where gas or liquid from the valve will not spray towards operators.
4. Remove the temporary Protective Cap and Gauze before assembly.
5. Clean the thread, flange and gasket so they are free of dust and dirt.
6. Screw the valve in by hand with the Setting Gasket, then tighten with a C-Spanner to the Torque for the gasket material.
7. Check the Wire Weld Seal and test for leaks after fitting.

• Perbunan/PTFE: 80 N·m ±5 N·m
• Composite/PTFE: 230 N·m ±5 N·m
• PTFE: 240 N·m ±5 N·m
• With a Bursting Disc Adaptor fitted: tighten the 6 M10 screws to 30 N·m ±5 N·m

• Weld-in Flange: 12 91 14 00 00 | Recess Flange: 12 92 14 00 00 (both Stainless Steel 316L, 6 mounting holes on PCD105)
• Seal: 11 10 01 60 00 | Screw Kit: 12 12 60 91 00
• Bursting Disc Adaptor: 11 91 15 00 01 | Pressure Gauge: 70 18 06 00 95
• Bursting Disc 4.84 Bar: DRS65P484T20 Matched to the 4.4 Bar valve at the standard ratio of 1.1 times the Set Pressure

Matching Spring Set

• Pressure Spring Set 4.40 Bar: 11 10 01 97 00
• Vacuum Spring Set 0.21 Bar: 11 10 01 98 00

Pressure and Vacuum Seals

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

Other parts

• Pressure Plate (Pressure Only): 11 10 01 99 01 | Pressure/Vacuum Plate: 11 10 01 99 00
• Vacuum Poppet: 11 10 01 99 02 | Vacuum Set Kit: 11 10 01 99 08 | Adjustment Nut: 11 10 02 99 06
• Flame Proof Gauze Kit: 11 10 01 50 91
• Composite/PTFE Gasket: 12 91 31 91 01 | Perbunan/PTFE Gasket: 11 10 01 93 00

The Maintenance Sheet confirms the Spring Set for Pressure 4.40 Bar and Vacuum 0.21 Bar as a standard matching part, so parts can be ordered right away.

The manufacturer recommends removing the valve for inspection in a Workshop about every 2 years, by qualified technicians with a Test Rig for Safety Relief Valves only.

After replacing seals or the Spring Set, test the opening point on a Test Rig, adjust the Set Pressure to exactly 4.4 Bar, check for leaks with Leak Test Fluid, check Vacuum Opening at 0.21 Bar, then seal the Cap with Stainless Steel Wire. Measurements must use a Class 0.5 accuracy Manometer, and only Spring Sets supplied by PEROLO should be used.

• Make sure the tank is not under pressure before removing the valve.
• Do not remove the Cover while the Spring Set is still loaded. The Spring Load is between 100 and 400 daN and can fly out violently.
• Disassembly and setting must be done in a Workshop by a specialist. Do not adjust the Set Pressure without a Test Rig.
• Do not remove the Wire Weld Seal before the inspection interval, and do not block the valve outlet.
• Check that the Flame Proof Gauze is not clogged.
• Check that the Pressure and Vacuum Settings match the tank specification and that the seal material suits the product carried.
• The manufacturer states that the warranty ends immediately if non OEM parts are fitted.

Gavan Asia supplies the genuine PEROLO 4.4 Bar safety relief valve, DN65, BSP, with Vacuum 0.21 Bar, for ISO Tank Containers, Road Tankers, Rail Tanks and liquid transport tanks.

We carry the full set of matching parts: Pressure Spring 4.4 Bar, Vacuum Spring 0.21 Bar, O-ring Kit, Flame Proof Gauze, Setting Gasket, Weld-in Flange, Pressure Gauge and a matching 4.84 Bar Bursting Disc, and we help check the Full Part Number and Certificate before you order.

For prices, specifications and stock ready to ship, contact Gavan Asia today.