This document specifies the terms and definitions, structure types, model designation, parameters, technical requirements, test methods, inspection rules, marking, and packaging, protection and storage for plunger flow control valves.
This document applies to manufacture of the plunger flow control valves of PN6 ~ PN25 in the nominal pressure and DN100 ~ DN2000 in the nominal size, using water as the working medium at 0 ℃ ~ 80 ℃.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance
GB/T 152.4 Fasteners - Counterbores for hexagon bolts and nuts
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 700 Carbon structural steels
GB/T 1176 Casting copper and copper alloys
GB/T 1220 Stainless steel bars
GB/T 1591 High strength low alloy structural steels
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous
GB/T 9124.1 Steel pipe flanges - Part 1: PN designated
GB/T 12220 Industrial valves - Marking
GB/T 12221 Metal calves - Face to face, end to end, center to face and center to end dimensions
GB/T 12223 Part-turn valve actuator attachments
GB/T 12227 General purpose industrial valve - Specification of spheroidal graphite iron castings
GB/T 12229 General purpose industrial valves - Specification of carbon steel castings
GB/T 12230 General purpose industrial valve - Specification of stainless steel castings
NB/T 47013.3-2015 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47013.4-2015 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5-2015 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47014 Welding procedure qualification for pressure equipment
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 17213.1 and the following apply.
3.1
plunger flow control valve
valve in which the crank link mechanism drives the plunger to move axially so that the throttling area is changed to fulfill the flow control function
3.2
deviation of rated travel
difference between the actual travel and the rated travel, expressed as a percentage of the rated travel
3.3
inherent flow characteristic
relationship between relative flow coefficient and relative travel, in which the former is the ratio of the flow coefficient for a given travel to the rated flow coefficient while the latter is the ratio of a given travel to the rated travel, where the travel is the distance that the plunger moves from the closed position
4 Structure types, model designation and parameters
4.1 Structure types
Plunger flow control valves (hereinafter referred to as “plunger valves”), by the form of the throttling element, are divided into slotted plunger valve, perforated plunger valve, vaned plunger valve, seat ring plunger valve and composite plunger valve. Typical structures are shown in Figures 1 ~ 4.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Structure types, model designation and parameters 4.1 Structure types 4.2 Model designation 5 Technical requirements 5.1 Structure requirements 5.2 Performance requirements 5.3 Connection end 5.4 Valve body 5.5 Structure length 5.6 Plunger 5.7 Valve seat 5.8 Stem 5.9 Stem bearing 5.10 Stem seal 5.11 Motive seal of plunger 5.12 Main seal 5.13 Crank rocker drive mechanism 5.14 Drive 5.15 Material 5.16 Welding 5.17 Non-destructive testing 5.18 Repair 5.19 Appearance quality 5.20 Requirements for drinking water service conditions 5.21 Ordering requirements 6 Test methods 6.1 General 6.2 Shell test 6.3 Sealing test 6.4 Pressurized opening operation test 6.5 No-load operation test 6.6 Measurement of shell wall thickness 6.7 Non-destructive testing 6.8 Inspection of valve body material 6.9 Flow coefficient inspection 6.10 Inspection of deviation of rated travel 7 Inspection rules 7.1 End-of-manufacturing inspection 7.2 Type inspection 8 Marking 8.1 Marking contents 8.2 Markings on the nameplate 8.3 Body marking 9 Packaging, protection and storage 9.1 Packaging and protection 9.2 Storage Annex A (Normative) Minimum wall thickness of the outer layer of iron valve body Annex B (Informative) Structural length Annex C (Informative) Order data sheet
