BS/EN 334-2019 pdf download.Gas pressure regulators for inlet pressure up to 10 MPa ( 100 bar ).
4.1.6 SealIng of the adjusting device
A means for sealing the adjusting device shall be available (e.g. wire, plastic seal or lacquer). If requested in the order specification, the adjusting device shall be sealed.
4.1.7 Springs
Springs shall not be overstressed under any operating condition and there shall be sufficient free movement of the spring to allow satisfactory operation. Springs shall be designed such that buckling does not occur, in accordance to EN 13906-1:2013. EN 13906-2:2013 and EN 13906-3:2014.
4.1.8 Parts transmitting actuating forces
When the regulator is classified as a stand-alone safety accessory, parts transmitting actuating forces shall be made of metallic material or non-metallic materials other than elastomers and shall be designed with a safety factor of 3 against permanent deformation. Verification Is made by proving the compliance of the actual safety factors specified above and the compliance of dimensions shown on drawings with values specified in the strength calculations. Alternatively, verification shall be made by an actual test.
4.1.9 Replaceable parts that may be affected by erosion or abrasion
The seat ring shall be replaceable where erosion or abrasion may occur.
4.2.1.1 Pressure bearing parts and inner metallic partition walls
The pressure bearing parts, including those that become pressure bearing parts in the event of diaphragm or differential pressure seal failure, and the inner metallic partition walls shall be constructed of materials complying with national or international established material standards for pressure applications and with the restrictions given in Table 5.
All selected materials complying with Table S which are neither complying with EN harmonized material standards, nor object of an EAM, shall be submitted to a Particular Material Appraisal procedure.
Note 1: all selected materials complying with Table 5 shall meet all the other requirements of the relevant national or international established material standard.
Annex G, tables Gi and G2 includes a list of proposed materials.
4.2.1.2 Auxiliary devices, Integral process and sensing lines, connectors, threaded sealing plug and fasteners
Auxiliary devices, integral process and sensing lines, connectors, threaded sealing plug and fasteners shall be constructed of materials complying with national or international established material standards and with the restrictions given in Table 5.
All selected materials complying with Table 5 which are neither complying with EN harmonized material standards, nor object of an EAM, shall be submitted to a Particular Material Appraisal procedure.
Note 1: all selected materials complying with Table 5 shall meet all the other requirements of the relevant national or international established material standard.
Annex G. Table G3 includes a list of proposed materials.
4.2.1.3 Other parts
The internal parts of regulators not subjected to differential pressure, may be constructed of either the materials given in Annex G or materials complying with the requirements given in Table 5, without taking into account the restrictions for pressures and nominal sizes, or of different materials provided they comply with the requirements of this document.
4.2.1.4 Material Inspection documents of pressure bearing parts and Inner metallic partition walls
Pressure bearing parts and inner metallic partition walls:
— bodies used in the apparatus8) category II, Ill and IV according to the European legislation on pressure equipment, shall be accompanied by a material inspection certificate type 3.2 in accordance with EN 10204:2004. For these bodies when the material manufacturer has an appropriate quality-assurance system, certified by a competent body established within the EC and having undergone a specific assessment for materials, an inspection certificate type 3.1 in accordance with EN 10204 is accepted;
8) Apparatus means gas pressure regulator or safety shut 0ft device as applicable.
— bodies used in the apparatus category I according to the European legislation on pressure equipment, shall be accompanied by a material test report at least type 2.2 in accordance with
EN 10204:2004.
Pressure bearing parts and inner metallic partition walls of other components used for regulators with:
— PS ≤ 25 bar can be accompanied by a material test report at least type 2.2 in accordance with
EN 10204:2004;
— PS> 25 bar shall be accompanied by a material inspection certificate at least type 3.1 in accordance with EN 10204:2004.
4.2.1.5 Material inspection documents of lasteners and connectors
This subclause specifies the different types of material inspection documents supplied to the purchaser. in accordance with the requirements of the order, for the delivery of components used for the apparatus.BS/EN 334-2019 pdf download.

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