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球阀检验规程


WI-Test procedure Inspection rules for finished products
1. Scope: It is stipulated in this document that of contents,requestments,methods and judgement of quality for finished products’

inspection and test. It can be applied to various kind of valves’ final inspection and testing.. It should subject to requestments from contact while there happens discrepancies
between that of contact and this documents.. 2. Apprearance: 2.1.1 Products should be free from burrs,clean,sharp edges, corners and other defectives.

2.1.2 Marks on valves body ,hanlde and other position should be exactly and clear. 2.1.3 No machining products or servely scras not allowed.And the surface should be clean
wiouth any marks by water,glue or other pollution.

2.1.4 Quality for surficial treatmnet, such as sanding,polishing, chroming and painting,
viscoplasticity should be correspond with provision indicated on related file and contract requestments.

2.1.5 Plastic and other nonferrous matal parts and stell filter cannot be severly strained and cracked. 2.2 Assemble 2.1.1 parts fit a. Valve body, bonnet and other related parts should be good coordinated. Installation stateshould be in accord with provisions from assemble drawing and related technical papers. b. Handle and stem shold be tight and compact fited.no visible clearance and deviation.No loosening existed after tightest closed the handle. Valve seat must not be anti-assembled.There is little biger deviation or exposure between valve seat and flow hole.. 2.2.2 testing ON or OFF a. Discs should be easily to open and stop.And handle is good,in a stress manner and no jam.. b.Discs,hanlds and stems should be free from severly distortion or sracths when turn it ON or OFF. c. The connect condiction between Discs’(like clack,gate,globe)switch and other positons should be with elastic pretightening force and allowance adjustable in sealed
condition.And also be in accord with related sample image and technical papers’reqestment. 2.2.3. . The angle between globe and valve body’s through hole centreline should follow requestments as below:. a.Valve steat(ball) must expose less than 0.5mm. while being over-positioned. b.valve seat may expose when ball hole off-centre or incrroect mounting postion.

----less than 0.8mm with size smaller than 1” ----less than 1.3mm with size biger than 11/4” 2.2.4 Handle angle

When ball valve be full open,the direction of handle should be the same as that of valve axis.And they would meet at right angle when full closed.The Max.angle between these two madia be 3 degree 2.3 Packing 2.3.1: Packing objects should be free fromcontamination, molded,damp and damaged. Its construction and material shoud be correspond with requestments from related documentaiton. 2.3.2 Marks in the packing should be clear and exactly.And the marks is the same as it in the products body. Mistakenly,mixed or neglected cannot be allowed.
2.3.3 Packing way,outer-carton’s sealing,wiring state should be confirmed with requestments from related documents. 2.4: Others If there is any requestments for products’ weight,construction,size or other program.It should be accord with those of requestments. 2.4 body and sealing function valve body,bonnet and other parts composed to be set valve.The discs and valve parts which requested sealing function should be with good quality.No leaking. 3. Finished products will take skip-lot sampling inspection.It will be as one inspection batch when takes same items and specifications at one time. 3.2: AQL lever a. Products with disqualify reah accumulative total AQL=2.5(inspection accoring to clause 2.1-2.5) b. Products with disqualify reah accumulative total AQL=1.0(inspection accoring to clause 2.6)


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