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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges

Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges
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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 1

T 2540 EN Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges Self-operated Pressure Regulators Application Excess pressure valve for set points from 0.075 to 3 psi (5 to 200 mbar) · Valve size NPS 2½ to 16 (DN 65 to 400) Class 150 and 300 (PN 16 or 40) · Suitable for gases at temperatures from –5 to 195 °F (–20 to +90 °C) The valve opens when the upstream pressure rises. The pilot-operated Type 2404-2 Excess Pressure Valve is preferably used for the precise control of inert gas in tank blanketing applications (e.g. when storing oxidation-sensitive, toxic or explosive products). It regulates the excess pressure of the inert gas to a constant pressure within the millibar range. The inert gas (usually nitrogen) is applied to protect the product inside the tank from reacting with the ambient atmosphere. In this way, the safe operation of tanks is achieved by allowing the tank to “breathe” in a controlled manner. Additional benefits include reduced pollution and inert gas costs. The pressure regulator ensures that the blanketing pressure in the tank remains constant while the tank is being filled. Furthermore, adverse weather conditions, e.g. direct sunlight, can affect the pressure inside the tank. In this case, the excess pressure valve equalizes the tank pressure, resulting in stable pressure conditions. Special features –– Low-maintenance proportional regulator –– Pilot control provides excellent control accuracy –– Internal set point springs Fig. 1: Type 2404-2 Excess Pressure Valve, NPS 16 –– Soft-seat plug provides bubble-tight shut-off performance –– Meets strict emission requirements –– Suitable for sour gas service (NACE) SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · s

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 2

The Type 2404-2 Excess Pressure Valve is a pilot-operated regulator. It consists of the following components: Type 2422 functioning as the main valve The Type 2404-2 Excess Pressure Valve is a pilot-operated regulator. It regulates the pressure of the inert gas upstream of the regulator within a very narrow mbar or psi range to a low pressure by opening when the pressure reaches the adjusted set point. This ensures that the blanketing gas (inert gas) is kept at a constant pressure level in the tank. NPS 8 to 16 (DN 200 to 400), balanced by a diaphragm, with Type 2420 Actuator The following...

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 3

Pilot valve Needle valve (lead-sealed setting) Input pressure regulator 1 Main valve To atmosphere or recovered for processing 1 Main valve 1.1 Closing spring Operating diaphragm 1.2 (main valve) 2 Pilot valve 2.1 Set point springs Operating diaphragm 2.2 (pilot valve) Set point adjuster (screw SW 27/11/8“) 2.4 Control line Input pressure regulator 3 (fixed setting) Needle valve (lead-sealed 4 setting) p Supply pressure Upstream pressure (blanketing gas pressure) Downstream pressure Control pressure Input pressure (pilot valve) Fig. 2: Functional diagram of Type 2404-2

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 4

Technical data Table 1: Main valve Type 2406 as main valve, balanced by a diaphragm Valve size Pressure rating CV coefficients KVS coefficients 0.07 to 0.2 psi · 0.15 to 0.4 psi · 0.3 to 0.9 psi · 0.7 to 3 psi 5 to 15 mbar · 10 to 30 mbar · 25 to 60 mbar · 50 to 200 mbar Set point ranges Actuator area Leakage class according to ANSI/ FCI 70‑2 or IEC 60534‑4 Soft-seated, minimum Class IV Permissible differential pressure Δp Perm. temperature Type 2422 as main valve, balanced by a diaphragm, with Type 2420 Actuator Valve size Pressure rating CV coefficients KVS coefficients Actuator area of...

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 5

Type 2406 functioning as the main valve Body Valve seat Plug seal Operating diaphragm, balancing diaphragm Internal parts, guiding parts Diaphragm cases Actuator springs Not for NPS 2½, 3 and 4 (DN 65, 80 and 100) Versions for sour gas service (NACE): Hastelloy® Type 2406 functioning as a pilot valve Pilot valve Valve seat Plug seal Operating diaphragm Internal parts, guiding parts Stainless steel Needle valve, input pressure regulator Versions for sour gas service (NACE) possible A351 CF8M on request Dimensions · NPS 2½ to 6 (DN 65 to 150) Table 4: Dimensions · NPS 2½ to 6 (DN 65 to 150)...

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 6

Dimensions · DN 200 to 400 · NPS 8 to 16 Table 5: Dimensions · DN 200 to 400 · NPS 8 to 16 (see Fig. 6 and Fig. 7) NPS 8 DN 200

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 7

Pipe Ø ½“ Control line for upstream pressure p1 Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Supply pressure p Fig. 3: Dimensions · DN 65 to 100 · NPS 2½ to 4 · Versions with seal/diaphragm made of EPD

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 8

Pipe Ø ½“ Control line for upstream pressure p1 Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Supply pressure p Fig. 4: Dimensions · DN 125 to 150 · NPS 6 · Versions with seal/diaphragm made of

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 9

Pipe Ø ½“ Control line for upstream pressure p1 Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Supply pressure p Fig. 5: Dimensions · DN 125 to 150 · NPS 6 · Versions with seal/diaphragm mad

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 10

Pipe Ø ½“ Control line for upstream pressure p1 Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Control line for upstream pressure p1 Fig. 6: Dimensions · DN 200 to 400 · NPS 8 to 16 · Versions with seal/diaphragm made

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Type 2404-2 Excess Pressure Valve with Pilot Valve for small set point ranges - 11

Pipe Ø ½“ Control line for upstream pressure p1 Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Supply pressure p Pipe Ø ½“ Control line for upstream pressure p1 Fig. 7: Dimensions · DN 200 to 300 · NPS 8 to 12 · Versions with seal/diaphragm

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