GB/T 14478-2025 PDF English
US$320.00 · In stock · Download in 9 secondsGB/T 14478-2025: Basic technical specification of inlet valves for large and medium-sized hydraulic turbines Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 14478: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14478-2025 | English | 320 |
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Basic technical specification of inlet valves for large and medium-sized hydraulic turbines
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| GB/T 14478-2012 | English | 85 |
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Fundamental technical requirements for large and medium inlet valves of hydraulic turbine
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| GB/T 14478-1993 | English | 319 |
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Fundamental technical requirements for large and medium inlet valves of hydraulic turbine
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GB/T 14478-2025: Basic technical specification of inlet valves for large and medium-sized hydraulic turbines
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14478-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.140
CCS K 55
Replacing GB/T 14478-2012
Basic technical specification of inlet valves for large and
medium-sized hydraulic turbines
Issued on. FEBRUARY 28, 2025
Implemented on. SEPTEMBER 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 8
4 Basic technical requirements... 9
5 Method for compiling the model of inlet valve... 13
6 Test methods... 13
7 Installation and operation... 15
8 Complete set supply scope... 16
9 Acceptance and guarantee... 16
10 Nameplate, packaging, transportation, storage... 17
Annex A (informative) Schematic diagram of some structural parts of bimetallic seal
water inlet ball valve... 18
Annex B (normative) Method for compiling inlet valve model... 19
Annex C (informative) Inlet valve spare parts... 21
1 Scope
This document specifies the basic technical requirements and model compilation
method for inlet valves for large and medium-sized hydraulic turbines. It describes the
test methods.
This document applies to the design, manufacture and acceptance of turbine inlet valves.
butterfly valves with a nominal diameter of 1000 mm~10000 mm and ball valves with
a nominal diameter of 500 mm~5000 mm.
Other butterfly valves and ball valves (including storage pumps, water regulating
pumps and pump-turbines) shall be implemented in accordance with this document.
2 Normative references
The following referenced documents are indispensable for the application 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/T 150 (all parts), Pressure vessels
GB/T 191, Packaging and storage marks
GB/T 2900.45, Electrotechnical terminology -- Hydroelectric powerplant machinery
GB/T 8564, Technical specification for installation of hydraulic turbine-generator
unit
GB/T 9652.1, Specification of hydraulic turbine governing systems
GB/T 9652.2, Testing specification of hydraulic turbine governing systems
GB/T 15468-2020, Fundamental technical requirements for hydraulic turbines
GB/T 22581-2008, Fundamental technical requirements for Francis pump-turbines
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 2900.45
and GB/T 40582 as well as the followings apply.
3.1 nominal diameter of inlet valve; D
The minimum inner diameter of the valve body where the inlet valve is connected to
the upstream and downstream pressure water pipe flanges.
NOTE. The unit is millimeter (mm). If the inner diameters on both sides are different, the smaller
value shall be taken.
3.2 maximum static head; Hst
After the inlet valve is closed, the water column height formed from the horizontal
center line of the inlet valve to the normal water level upstream.
3.3 maximum static pressure; pc
After the inlet valve is closed, the water pressure formed from the horizontal center line
of the inlet valve to the normal water level upstream.
3.4 maximum momentary pressure; pm max
The maximum gauge pressure generated at the horizontal center line of the inlet valve
during the transition process.
NOTE. The unit is megapascal (MPa).
3.5 design pressure; pd
The pressure used for strength design of flow-through parts of inlet valves of turbines.
4 Basic technical requirements
4.1 The design pressure of the inlet valve shall not be less than the maximum transient
pressure. The design, manufacture and inspection of the inlet valve and the pressure-
bearing parts of the piping system shall comply with the provisions of GB/T 150 (all
parts), 4.2.1.21 of GB/T 15468-2020 and 4.2.1.21 of GB/T 22581-2008.
4.2 When the unit is shut down normally or under maintenance, the inlet valve shall be
closed reliably.
4.6 When the pressure difference on both sides of the inlet valve is no more than 30%
of the maximum static water pressure, it shall be opened normally.
4.7 The assembly of inlet valve shall be assembled at the manufacturer. After assembly
and installation in the power station, it shall ensure flexible movement and accurate full
open and full closed positions.
4.8 The following parts of the inlet valve structure shall be replaced without
disassembling the valve body.
4.9 The butterfly valve seal shall be solid and set on the downstream side of the butterfly
valve. The belt and the sealing seat shall have sufficient compression. If the butterfly
valve seal adopts air belt seal, it is advisable to adopt a uniform standard cross-sectional
size of 50 mm outer diameter and 30 mm inner diameter. The working air pressure of
the belt shall be 0.1 MPa~0.2 MPa higher than the maximum hydrostatic pressure. The
maximum air pressure is allowed to be adjusted to 0.4 MPa higher than the maximum
hydrostatic pressure.
4.17 The inlet valve shall be able to be operated automatically or manually.
4.18 The inlet valve shall be equipped with one or more of the following signal devices
when clearly specified in the contract.
4.19 According to the actual use conditions of the inlet valve, the material of the inlet
valve shall comply with the following requirements.
4.20 The structural type of the inlet valve shall comply with the following requirements.
5 Method for compiling the model of inlet valve
The model compilation method of the inlet valve shall be in accordance with the
provisions of Annex B.
6 Test methods
6.1 Inlet valve assembly test
Usually according to the contract requirements, the inlet valve shall be subjected to the
following tests after assembly in the manufacturing plant.
6.2 Relay assembly test
When the operating mechanism of the inlet valve adopts a direct cylinder servo, the
servo shall be subjected to the following tests after being assembled in the equipment
contractor's factory.
6.3 Requirements for valve watertight seal test and flaw detection
When the design pressure is less than or equal to 0.6 MPa, the water sealing weld of the
inlet valve shall be subjected to kerosene penetration test. It is required that no
penetration shall occur. When the design pressure is greater than 0.6 MPa, magnetic
particle or color flaw detection shall be performed.
6.4 Dynamic water shut-off test
Before the dynamic water shut-off test of the inlet valve is carried out, a detailed test
outline shall be formulated with the equipment contractor to ensure the safety of the
test. After the dynamic water shut-off test, the inlet valve and its ancillary equipment
shall be inspected according to the requirements of the test outline.
7 Installation and operation
7.1 During installation on site, the requirements of GB/T 8564 and the drawings and
relevant technical documents of the equipment contractor shall be followed.
7.2 The oil, water and gas pipelines formed and welded on site shall be subjected to
water pressure or oil pressure test. The test pressure shall be 1.5 times the design
pressure of the corresponding pipeline and the test time shall be 30 min.
7.4 The operation shall be carried out strictly in accordance with the relevant technical
documents and automated operation procedures. The inlet valve equipment and
accessories shall be maintained regularly.
7.5 If hydraulic self-excited vibration occurs during the operation or maintenance of the
ball valve, it can be eliminated by opening the bypass valve or inserting the maintenance
sealing ring.
8 Complete set supply scope
8.1 The complete set of inlet valves operated by oil pressure or water pressure shall
include.
8.2 Special tools and spare parts for installation, disassembly and maintenance of inlet
valves.
8.3 The following technical documents shall be provided for each inlet valve.
9 Acceptance and guarantee
9.1 Inlet valve products and main components shall be inspected and qualified by the
manufacturer before leaving the factory, and shall be accompanied by documents
proving the product’s qualification.
9.2 During the product warranty period, the water leakage of the inlet valve under
normal working conditions shall comply with the provisions of the technical agreement
between the supplier and the purchaser.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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