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Self-operated Pressure Regulators · Type 2404-1

Self-operated Pressure Regulators · Type 2404-1
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Self-operated Pressure Regulators · Type 2404-1 - 1

T 2538 EN Self-operated Pressure Regulators · Type 2404-1 Pressure Reducing Valve with Pilot Valve for small set point ranges Application Pressure reducing valve for set points from 0.045 to 1.5 psi/3 to 100 mbar · Valve size NPS 1 to 6/DN 25 to 150 Class 125, 150, 300/PN 16 to 40 · Suitable for gases at temperatures from –5 to 195 °F/–20 to +90 °C The valve closes when the downstream pressure rises. The pilot-operated Type 2404-1 Pressure Reducing 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). The inert gas (usually nitrogen) is applied to protect the product inside the tank from reacting with the ambient atmosphere. The Type 2404-1 Pressure Reducing Valve regulates the excess pressure of the inert gas to a constant pressure within the millibar range. The pressure regulator ensures that the pressure in the tank remains constant during pumpout operations. Furthermore, adverse weather conditions, e.g. a sudden temperature drop, can affect the pressure inside the tank. In both cases, inert gas flows into the tank until the pressure reaches adjusted set point. Special features –– Low-maintenance proportional regulator –– Pilot control provides excellent control accuracy –– Internal set point springs –– Soft-seat plug provides bubble-tight shut-off performance –– Meets strict fugitive emission requirements –– Suitable for sour gas service (NACE) Versions The Type 2404-1 Pressure Reducing Valve is a pilot-operated regulator. The regulator consists of the following components: Type 2406 functioning as the main valve NPS 1 to 6/DN 25 to 150, balanced by a diaphragm Type 2405 Pilot Valve ½ NPT female thread, CV 1.2/KVS 1.0 Type 44-1 B Input Pressure Regulator With NPT female thread; CV 1.2/KVS 1.0 Mounting kit M 2404-1, consisting of: Hook-up, needle valves etc. Special versions Version with FDA-compliant materials for the food processing and pharmaceutical industries · Versions for sour gas service (NACE) · Actuator of pilot valve with seal and leakage line connection (e.g. for flammable gases) SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49

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Self-operated Pressure Regulators · Type 2404-1 - 2

Principle of operation The Type 2404-1 Pressure Reducing Valve is a pilot-operated regulator. It regulates the supply pressure of the inert gas within the millibar range to a low pressure, creating a constant blanketing of the product inside the tank. The following components interact to regulate the pressure of the inert gas. The input pressure regulator (3) is delivered ready-adjusted. It reduces the supply pressure 1) p to the input pressure pe for the pilot valve (2) to approx. 1 bar (positive pressure), ensuring precise pressure control even at varying upstream pressures. The pilot...

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Self-operated Pressure Regulators · Type 2404-1 - 3

Technical data Table 1: Type 2404-1 Pressure Reducing Valve Type 2406 as main valve, balanced by a diaphragm Valve size 4) Pressure rating CV coefficients KVS coefficients Reduced CV coefficient Reduced KVS coefficient CV with flow divider 1) KVS with flow divider 1) 0.045 to 0.15 psi · 0.075 to 0.45 psi · 0.35 to 1.5 psi 3 to 10 mbar · 5 to 30 mbar · 25 to 100 mbar Set point ranges Actuator area Leakage class according to ANSI/FCI 70‑2 or IEC 60534‑4 Soft-seated, minimum Class IV Max. perm. differential pressure Min. differential pressure Δpmin Perm. temperature Reduced CV/KVS...

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Self-operated Pressure Regulators · Type 2404-1 - 4

Table 3: Materials · Material numbers according to ASTM and DIN EN Type 2405 Pilot Valve Pilot valve Body Valve seat Plug seal Operating diaphragm Internal parts, guiding parts Stainless steel Needle valve, Type 44-1 B Input Pressure Regulator Version for sour gas service (NACE) possible A351 CF8M on request Table 4: Dimensions and weights Type 2404-1 Weight, approx. Type 2404-1

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Self-operated Pressure Regulators · Type 2404-1 - 5

H Pipe Ø ½“ control line (downstream pressure p2) Fig. 3: Dimensions · DN 25 to 100 · NPS 1 to 4 · Versions with seal/diaphragm made of EPDM/NBR/FKM

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Self-operated Pressure Regulators · Type 2404-1 - 6

Pipe Ø ½“ control line (downstream pressure p2) Fig. 4: Dimensions · DN 125 and 150 · NPS 6 · Versions with seal/diaphragm made of EPDM/NBR

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Self-operated Pressure Regulators · Type 2404-1 - 7

H Pipe Ø ½“ control line (downstream pressure p2) Fig. 5: Dimensions · DN 125 and 150 · NPS 6 · Versions with seal/diaphragm made of FKM

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Self-operated Pressure Regulators · Type 2404-1 - 8

Installation The regulator is delivered as a ready-toinstall unit. –– Install the main valve in the pipeline at the site of installation and connect the control line (inert gas pressure p2) to the pilot valve (pipe Ø ½“). Install the regulator in such a way that it is still easily accessible after the plant is completed to facilitate maintenance or revision work. Allow enough space for set point adjustment at the pilot valve using a socket wrench. The following points must be observed: –– Installation in horizontal pipelines –– Install the valve assembly with the pilot valve pointing up ––...

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