【正文】 ressure vessel joint J and a second outer annular surface 18b formed adjoining the first outer annular surface 18a and adapted to be disposed adjacent the interior surface 10g of the pressure vessel joint J. A first cavity 18c is formed in the first outer annular surface 18a adjacent outer extremity 18d and a second cavity 18e is formed in the second outer annular surface 18b adjacent the outer extremity 18f. A first undercut portion 18g is formed in the first outer annular surface 18a between the first cavity 18c and the outer extremity 18d of the first outer annular surface 18a. A second undercut portion 18h is formed from the second outer annular 南華大學(xué)機械工程學(xué)院 surface 18b between the second cavity 18e and outer extremity 18f of the second outer annular surface 18b. A first inner annular surface 18i is preferably formed adjacent outer extremity 18d with second inner annular surface 18j formed between the first inner annular surface 18i and outer extremity 18f. As a consequence, the annular seal ring R of the present invention is of a substantially quadrilateral configuration having two truncated end portions at the outer extremities 18d, 18f, with such quadrilateral configuration being substantially of that of a parallelogram. 形成在第二環(huán)形外表面 18b的側(cè)向部分 18h是在第二凹腔 18e和第二環(huán)形外表面18h的 外 端 18f之間。因此，本發(fā)明的環(huán)形密封環(huán) R本質(zhì)上是一個四邊形結(jié)構(gòu)， 外端 18d， 18f里 有兩個斜截頭的 末端 ，這種四邊形結(jié)構(gòu)大體上是一個平行四邊形。這取決于本發(fā)明壓力容器密封元件 S受到壓力容器 P的環(huán)境里的影響。然而，材料應(yīng)該在稍高的壓力下是能夠收縮的，卻沒有顯示任何金屬疲勞，開裂或類似的。 壓力容器密封 S的環(huán)形密封環(huán) R是由這些形成的，其中當(dāng)壓力容器 P在較低壓力條件下，第一環(huán)形外表面 18a與壓力容器接縫 J的內(nèi)壁 12e有 一個角度關(guān)系，以及環(huán)形密封環(huán) R的第二環(huán)形外表面 18b，當(dāng)壓力容器 P在較低壓力條件下， 18b與壓力容器接縫 J的內(nèi)壁 10g有一個角度關(guān)系。 It is preferable that the ring 18 be formed of any suitable high strength material such as stainless steel, any suitable alloy, or the like, dependent upon the environment to which the pressure vessel seal S of the present invention is subjected to within the pressure vessel P. This contemplates selecting materials that must withstand corrosive effects, high temperatures, as well as high pressures as the situation demands. However, the material should be able to flex slightly under high pressures without demonstrating any metal fatigue, cracking or the like, as discussed more fully hereinbelow. The annular seal ring R of the pressure vessel seal S is formed such that the first outer annular surface 18a is at an angle with respect to the interior wall 12e of the pressure vessel joint J when the pressure vessel P is under minimal pressure conditions and that the second outer annular surface 18b of the annular seal ring R is at an angle with respect to the interior surface 10g of the pressure vessel joint J when the pressure vessel P is under minimal pressure conditions. This mating angle between the annular seal ring R and the corresponding sealing surfaces 10g, 12e of 南華大學(xué)機械工程學(xué)院 the pressure vessel joint J results in a minimum portion of the annular seal ring R contacting the pressure vessel joint J initially, hence requiring a lower preload while at high pressures. Thus, the annular seal ring R can flex and bend to lower bearing pressures adjacent the undercut areas 18g, 18h of the ring 18, as shown in FIG. 3. 因此，環(huán)形密封環(huán) R可以伸縮和彎曲 ，而降低相鄰側(cè)向區(qū)域 18g,18h的承載壓力，如圖 3所示。 由于壓力容器密封 S接觸表面壓力的變化以及壓力容器 P內(nèi)壓力的變化， 涂料方法 C是 自潤滑和可以充分運用在環(huán)形密封環(huán) R的表面，允許容忍壓力容器接縫 J相鄰的較多表面缺陷，同時制造價格低廉和可以多次使用 。 南華大學(xué)機械工程學(xué)院 南華大學(xué)機械工程學(xué)院