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ab baat karte hain valve ke sab se ahem androoni hisson ki. Yani Valve Trim Components ki. Trim ka matlab woh internal parts hain jo fluid flow aur pressure ko directly handle karte hain. Is mein pehla component Stem hai. Stem ek lamba shaft hota hai jo handle ya actuator ki movement ko closure member tak pohnchata hai. Doosra component Disc ya Wedge hai. Yeh woh physical member hai jo flow ko bilkul block ya open karne ka zimmedar hota hai. Teesra ahem part Seat Surfaces hai. Yeh valve body ke andar ka woh makhsoos area hota hai jahan disc aakar baithti hai aur tight sealing faraham karti hai. Chautha component Backseat hai. Yeh stem packing area mein ek safety sealing surface hoti hai. Iska faida yeh hai ke valve full open condition mein bina leakage ke packing replace karne ki ijazat deta hai. Fitters ke liye technical point yeh hai, ke API standards ke mutabiq trim numbers valves ki material selection ko zahir karte hain. Overhauling ke doran seat surfaces aur disc par koi bhi scratch nahi hona chahiye. Kyonke mamooli sa scratch bhi valve passing aur internal leakage ka baais ban sakta hai.
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