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一、引言1.本条件只适用于压力为63公斤/厘米~2的中压流量阀的产品出厂验收。至于新产品的试制鉴定及科研性试验不包括在本条件内。2.验收项目分必检和抽检两项,必检项目是指每一个产品都要进行检查的项目,抽检项目是指每批中抽检2%,发现有一个不合格再抽5%,若再发现不合格全部检查,但每批(该批少于50个者)至少要抽检2个。3.压力的测量一般用普通压力表,其量程应采用100公斤/厘米~2,精度等级宜在1.5级。4.流量的测量可用流量计或测量油箱,流量计的误差应在2.5%以内,用测量油箱时可用容积法或重量法。对于小流量及泄漏量的测量可用量杯测量,泄漏量应以接通压力15秒后测量的第一分钟的泄漏为准。5.各种流量阀的技术性能要求是指在油粘度为17～23厘沲时的性能,即相当于采用20号液压油、20号机油或22号透平油在油温为50℃时的粘度,故试验时应尽量控制油温
I. Introduction 1. This condition applies only to the pressure of 63 kg / cm ~ 2 medium-pressure flow valve products factory acceptance. As for the trial production of new products and research tests are not included in the conditions. 2. Acceptance points must seized and sampling two, will seized item refers to each product to be inspected items, sampling project refers to each batch of sampling 2%, found that there is a failure and then pumping 5%, and then Unqualified all inspection found, but each batch (batch of less than 50) at least two sampling. 3. Pressure measurement is generally used ordinary pressure gauge, the range should be used 100 kg / cm ~ 2, the accuracy level should be 1.5. 4 flow measurement Available flowmeter or measurement tank, flowmeter error should be less than 2.5%, the volumetric method used when measuring the tank or gravimetric method. For small flow and leakage measurements can be measured Cup, the amount of leakage should be measured after the first 15 seconds after the pressure switch leak prevail. 5. Various flow valve technical performance requirements refer to the performance of the oil viscosity of 17 to 23 centistokes, which is equivalent to the use of 20 hydraulic oil, 20 oil or 22 turbine oil at an oil temperature of 50 ℃ The viscosity, so the test should try to control the oil temperature