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Annex A. LF-310/311 – ‘Solid Disk’ Main Valve Design
A.1. Description
The ‘solid disk’ type main valve assembly was introduced as an alternative to the unique
‘cone type’ assembly and could be applied where greater resistance to both temperature
and pressure were required. The new disk design allows for a wider range of seat material
options as well as increased Cv and Pressure combinations.
The model number ‘LF-310/311’ was assigned to denote the requirement for the new disk
type main valve arrangement. The LF-310/311 ‘solid disk’ option allows for a Maximum
Working Pressure of 300 Bar (4350 Psi) or 414 bar (6000 Psi) when fitted with a PEEK seat.
The LF-310 is capable of accurately controlling pressures of up to 35 bar (510 Psi).
A.2. Servicing
The servicing of the LF-311 regulator should be performed in line with the service
instructions for the LF-301 as defined in Section 6 of this manual, taking account for the
difference in valve assembly. The figures below detail the alternate main valve assembly for
reference purposes only.
A.2.1. Figure 2 – Detail A: LF-310/311 ‘Solid Disk’ MVA (sectional)
A.2.2. Figure 3 – Exploded View of LF-310/311 ‘Solid Disk’ MVA
