TW490535B - High pressure fluid seal assembly and method for restricting motion of a spring disposed about a plunger of a high pressure fluid pump - Google Patents

Abstract

A method and apparatus for biasing a seal assembly in a high pressure fluid pump. In one embodiment, the fluid pump includes a reciprocating plunger, a seal carrier disposed about the plunger, and a seal supported by the seal carrier and sealably engaged with the plunger. The seal may be biased toward the seal carrier with a spring and may include a flange that engages the spring to restrict lateral motion of a spring relative to the reciprocating plunger. The flange may engage an inner and/or an outer surface of the spring. Where the spring is a coil spring, the flange may be continuous around the circumference of the spring or may include a plurality of spaced apart projections located around the circumference of the spring.

Description

490535 --- El_87115582 Car Moon Day 绦 ϊρ 5. Description of Invention (1) " ~ ^ Cross-reference to related applications in the process of trial 0 This declaration was filed on September 18, 1997, and is currently a US patent Partial extension of application number No. 08/932, 690 TECHNICAL FIELD The present invention relates to the dense invention of a high-pressure fluid pump with a reciprocating plunger. BACKGROUND OF THE INVENTION 70,000.00 is now available for an anti-squeeze seal that can surround one of the plunger shaft bushes to be supported in the hole, and the plunger passes through this. The seal design is very difficult to reach and there will be contact. Ask for a leak around the plunger. SUMMARY OF THE INVENTION The present invention is directed to methods and apparatus. The high-pressure fluid pump body leaking with at least one opening and plug. Withstand pressure of more than 10,000 PS i in this class. The sealing of this environment ′ The back support ring and the coil spring hold it against the sealed positioning hole, and one of the problems is that the column is maintained. Therefore, non-friction heating can be provided from a device entitled Sealed Components with a reciprocating plunger that can include a steam and long plunger through which must be provided-Lizhong'seal must be Psi and even up to the design including a back seal by A sealing bracket is biased towards the sealing frame. The bushing has a flange that surrounds the spring. The plunger is typically between the plunger and the backing ring, and the seal may cause wear and tear over time. A high pressure fluid pump cylinder, the cylinder has the opening, and a spring seal. The surround can be supported at a height above the support ring support and the spring can have a penetrating end. Gap · Tolerance and backing ring. One cylinder wall spring of the current sealed fluid seal assembly is installed in

WJ J J WJ J J Year-Case No. 871 V. Description of Invention (2) = Plug = Near. Elastomers can be-the inner surface faces the pillar assembly can be further-including-a seal, the seal has an outer surface facing away from the pillar "" and has-a joint surface that engages at least two surfaces against the outer surface to limit The inner surface of the plunger can have several shapes in the seal. For example, a dense edge extends around the perimeter of the spring. Another option, dense: bag " a continuous convex partition = engagement bullet, etc. In a further embodiment, a plurality of indirect 5 surfaces adjoining the inner surface of the spring and a first edge may have a first surface. The mouth surface adjoins the outer surface of the spring. The invention also aims at a method of restricting the movement of a high-pressure pump. The method may include sealing the -bomb J near the plug, sealing the seal with at least one of the spring inner surfaces and sealably engaging the branch 5, and restricting the lateral movement of the plunger about the plunger .: Facing the spring-termination The method may include joining the inner surface and the outer surface of the spring, and the choice is' the side: the opposite side of the spring. When the bullet f is a coil spring: the step includes the connection of 3. Corresponding to the one of the wire radius of the spring Philosophy: inch, the method can include or can include bonding Pass a spring winding. Furthermore, a part of the winding, the diagram is briefly explained. Figure 1 is a partial cross-sectional view of a sealed pump assembly according to a preferred embodiment of the present invention. 6 Yes-sealed bracket and Figure 2 are Figure 3 of the seal and seal bracket shown in Figure 1 is an enlarged detail ^ 4 cross-sectional view of the seal assembly shown in Figures 1 and 2. Figure 4 is a second embodiment according to another embodiment of the present invention, and has a seal Part of a seal assembly σ — an external surface view of a spring.

490535 _ Case No. 87115582_ Year Month Date ____ V. Description of the Invention (3) FIG. 5 is a partial cross-sectional view of a seal assembly that joins an inner surface of a spring and has a seal according to another embodiment of the present invention. Fig. 6 is a partial cross-sectional view of a seal assembly that joins the inner surface and the outer surface of a spring and has a seal according to another embodiment of the present invention. Fig. 7 is an isometric perspective view of a seal with a protrusion according to another embodiment of the present invention. Fig. 8 is a partial cross-sectional view of a seal assembly having a back rest ring according to another embodiment of the present invention. Description of element number D diameter 56a joint surface 10 seal assembly 60 seal spring 11 area 61 inner surface 12 seal bracket 62 outer surface 13 hole 64 winding 14 plunger 117 seal 15 first ring groove 154 ring flange 16 Two annular grooves 156 engagement surface 17 annular seal 217 seal 18 end area 254 annular flange 19 annular guide bearing 256 engagement surface 20 inner diameter 260 seal spring 21 inner diameter 261 inner surface 22 high pressure pump assembly 262 outer surface 23 pressure area 264 winding 24 high pressure cylinder 317 seal

O: \ 55 \ 55029.ptc page 7 said "Duozheng 354a inner flange 354b outer flange 356 a joint surface 356b joint surface 517 seal 554 joint member 556 joint surface 557 hole 612 seal bracket 617 ring seal 6 3 4 Back support ring 6 5 4 The flange part reaches 1 87115582 5. Description of the invention (4) 25 annular elastomer seal 26 drive mechanism 2 8 body 3 0 check valve 31 into aifu 3 2 outlet 崞 3 3 lifting head 34 Lifting head spring 50 Shaft bushing (or retaining member) 54 (ring) flange portion 5 4 a flange portion 55 sealing surface 5 6 joining surface Detailed description of the invention-as = 1, according to the present invention a comparison The preferred embodiment provides a high-pressure fluid seal. Zhao Feng assembly 10 is applied to a high-pressure pump assembly 22, which has a reciprocating plunger 14 connected to a drive mechanism 26. The plunger 14 reciprocates in a high-pressure n cylinder 24. The sealing assembly 10 is adjacent to the plunger 14 at one end of the cylinder 24. 4. Limit and / or prevent high-pressure fluid from leaking from a high-pressure region 23 in the south-pressure cylinder 24. A check valve 30 located at the opposite end of the cylinder 24 includes a plurality of inlet ports 31, an outlet port 32, and a lifter 33 that seals the inlet port. When the plunger 14 is partially withdrawn from the cylinder during an entry stroke, the check valve 30 directs fluid through the inlet port 31 and into the cylinder 24. When the plunger 14 moves into the steam rainbow during a pressure stroke, the check valve 30 directs the pressurized fluid out of the cylinder 24 through the outlet port 3 2. O: \ 55 \ 55029.ptc Case No. 871155S on page 8 Amendment & Description of Invention (5) — Shaft bushing or maintenance member 5 〇 Can be placed in the cylinder 2 4 Seal assembly 1 〇 and non-return Valve 30 to reduce the internal volume of the cylinder and thereby increase the pressure generated by each pressure stroke of the plunger 4. The shaft bushing 50 also applies a biasing force to the lifting head 33 via a lifting head bomb 34, and applies a biasing force to the components of the seal assembly 10 via a sealing spring 60, as described in detail below. As shown in FIG. 2, the sealing assembly includes a sealing bracket 2 having a hole through which the compound plunger 14 penetrates. The sealing bracket 12 has a first groove 15 and an annular seal 17 is installed in the groove. The ring seal 7 has a seal surface 5 5 that seals against the plunger 1 4. An annular elastomer seal 2 5 surrounds the outer seal 1 7 to excite the annular seal / 17 during the beginning of a pressure stroke. The seal spring 60 engages the annular seal 17 and pushes it toward the first annular groove j to move the annular seal 17 away from the seal bracket 12. The sealing bracket 12 has a body-shaped guide bearing 19 which is installed in the hole 13 and a second annular groove 162. The second annular groove 16 and the guide bearing 19 installed therein are axially spaced from the first annular groove 15 and the annular seal 17 contained therein. FIG. 3 is a detailed sectional view of the seal bracket 12 and the guide bearing 19 shown in FIG. 2. As shown in FIG. 3, an inner diameter 20 of one of the guide bearings 19 is smaller than the seal bracket hole 13 in an area π between the seal 17 (FIG. 2) and the guide 19, and the inner diameter 21 is smaller. For example, in an embodiment, the inner diameter 20 is smaller than the inner diameter 21... 0 .05 .00 = 15 inches. 1 According to this principle, one end region 18 (FIG. 2) of the annular seal 17 is dense. The area 11 of the bracket 12 is supported; however, the area 11 of the sealing bracket 12 is not in contact with the column 4 because the direct control 21 of the hole 13 is larger than the inner diameter 20 of the guide bearing ig in the area 11. One embodiment of the blanket seal assembly 10 is shown in Figure 3, so

490535 V. Description of the invention (6) A seal 17 is supported by the seal bracket 12, eliminating the need for a guide bearing 19 on a back support ring to prevent the plunger u from contacting the seal bracket 12, thereby reducing frictional heating in the vicinity of the seal 17. To extend seal life. To further extend the life of the assembly, the component materials are selected to minimize friction between the plunger 14 and the guide bearing 19 and between the plunger 14 and the seal 17. In one implementation, the plunger 14 is made of locally stabilized zirconia ceramic, the guide bearing 9 is made of a resin-impregnated graphite, and the seal is made of an ultra-high molecular weight polyethylene. However, it should be noted here that many different materials can be used and that the selection of one component can be based on the material of another component. To further increase the reliability of the seal 17, the seal assembly 10 is preferably manufactured by pressing the guide bearing 19 into the seal bracket 12 and processing it through the guide bearing and through the seal bracket with the same processing settings. Hole in area u 丨 3. As mentioned above, the inner diameter of the inner hole 13 of the area 11 is machined to be slightly larger than the inner diameter 20 of the hole passing through the guide bearing. However, by processing the two areas with the same settings, the concentricity of the components can be improved compared to the conventional technology system. The components of the conventional technology system are assembled and processed separately. Returning to FIG. 2, the seal 17 can be radiated toward the seal support = 12 H by the seal spring 60 as described above, and the seal spring 60 can include-a wire is wound around the plunger 14 to form a plurality of windings 64 surrounding the plunger. Each winding 64 may have an inner surface 62 facing the plunger 14 and an outer surface 62 facing away from the plunger. In other embodiment 10, the spring 60 may also have other springs capable of biasing the ring seal 17 toward the seal bracket 12 and it is found that the seal spring can be bent across the axis of the plunger 4 and rubbing the shaft bushing 50. As a result, the seal spring may be worn and may be dense

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490535

The seal of the cyanine exerts an uneven load, causing the seal to leak. Another option ' seal spring can cause wear on the bushing 50 or plunger 14, reducing the useful life of the above components. One way to solve the problem of spring wear is to increase the size of the hole penetrating the shaft bush 50 ′ to reduce the possibility of the outer surface of the sealing spring contacting the inner surface of the hole. The problem with this method is that it may bend laterally when the seal spring is placed in a larger hole. Therefore, even if the outside surface of the seal spring does not touch the inside surface of the hole! The inner surface is more likely to contact the plunger 14, resulting in wear of the seal spring and plunger and an uneven load on the seal. / Therefore, in an embodiment of the present invention, the annular seal 17 may include an integral portion M t and an annular flange portion 54. The flange portion 54 extends away from the body and is concentric with the seal spring 60, the plunger 14 and the ring seal 17, and engages the seal spring ί2: For example, the flange portion 54 may have a joint surface 56 to join密 ^ 之 两 Winds 6 4。 Therefore, the bonding surface 56 can be curved to correspond to the shape. In other embodiments, the bonding surface 56 can be connected to the winding 64 and / or other parts of the sealed spring 60, as described in detail below in 5V: 4: 9. In a further alternate embodiment, ^ spring / ο is engaged. The mouth has a dense outer shape other than the axisymmetrically wound shape shown in FIG. 2 and the flange portion 54. One of the advantages is that it can engage the sealing surface 62 of the seal spring 60 and restrict the seal spring from crossing the plunger 14 axis of the seal spring. 60 is less likely to come into contact with the fork 14 / interlocking. Therefore, ^ ^ ^ J Moon Dagger contacts the plunger 14 and / or the shaft bushing 50, the potential

Also add the plunger, the shaft sleeve and the seal shell. A seal "fin" can be used to seal the yellow. Furthermore, by reducing the friction between the plunger 14 and the shaft bush, Endogenous

490535 ----- Case No. 87115582 V. Description of Invention (8)

Ά_Day The heat of the correction is reduced ', thereby extending the life of the seal 17. As shown in Fig. 2, the shaft sleeve $ -T * ^ a u and u: may include a flange portion 54a having a -joining upper surface 56a. The joint surface 56a can be used to place the outer surface b 2 of the joint sealing spring 60, in contrast to the joint 17 of the seal 17 and the β 4 standing person, the part of the seal spring to which the surface 56 is joined. By engaging the outer surfaces 62 of the two ends of the seal spring 60, the shaft bushing 50 and the seal 17 can be—the same as reducing the possibility of the seal spring 60 crossing the plunger 14 and further increasing the seal assembly components. Of life.

4 is a partial cross-sectional view of a seal assembly with a seal, 7 and the same-shaped flange 15, 4 according to another embodiment of the present invention. Flange 丨 5 = a part of the engaging surface 156 engaging the sealing spring 60, which is approximately equal to one and a half of the diameter D of the wire constituting the bifurcated spring. In other embodiments, the flange 154 may engage one of the sealing springs 60 during lateral movement of the sealing spring to the plunger 14 to limit and / or prevent the sealing spring from plunger 14 being large or Smaller part. One of the advantages of the seal 1 1 7 is that when compared with the seal 17 shown in Fig. 2, the seal 117 requires less manufacturing material.

FIG. 5 is a partial cross-sectional view of a seal assembly 10 having a seal 217 connected to the same annular flange 254 adjacent to the plunger 14. FIG. The seal 2 1 7 can thus sealably engage a larger portion of the plunger 14 and can therefore provide a better seal to the plunger. The flange 254 has an engaging surface 256 that engages an inner surface 261 of a sealing spring "ο to limit and / or prevent lateral movement of the sealing spring 260 with respect to the plunger 14 and the shaft bushing 50. The engaging surface 256 can engage the sealing spring" A single winding 264, or a larger or smaller area that can engage one of the springs, as previously described with reference to Figures 2 and 4. The bushing 50 can engage the outer surface 262 of the seal spring 26, as shown in FIG. 5, or another option is to maintain the bushing 50 with the plunger

O: \ 55 \ 55029.ptc Page 12 490535

14 The inner surface 261 of the seal spring 26 can be engaged at intervals. FIG. 6 is a partial cross-sectional view of a seal assembly 10 having a seal 317 with the same inner flange 354a and an outer flange 3 54b spaced apart. The inner flange 35 "has an engaging surface 35 6a engaging the inner surface 61 of the seal spring 60, and the outer flange 354b has an engaging surface 3 56b engaging the outer surface 62 of the spring. Therefore, the seal 317 can further prevent the spring 60 Lateral movement of the plug 14. Fig. 7 is an isometric perspective view of a seal 517 with a plurality of engaging members 5 54 spaced around a periphery of a hole 557. The holes 5 57 are sized to slidably engage the plunger 14 (Fig. 2) And the joint member 554 may include a joint-sealed spring

60 (Figure 2) of the bonding surface 556. In the embodiment shown in FIG. 7, the joint surface 5 ^ 6 is set to engage the outer surface 62 of the seal spring 60 (FIG. 2), and in other embodiments, the joint surface may be set to engage the inner surface 6 of the seal spring 6 i (figure 2 ). In the embodiment shown in FIG. 7, the seal 5 丨 7 may include six joint members 5 5 4 ′ and may include a larger or smaller number of joint members in other embodiments. FIG. 8 is a partial cross-sectional view of the male and seal assembly 10 including a seal bracket 612 holding an annular seal 617 and two back brackets 634. The backing ring 6 3 4 can support an annular seal 617 about the plunger 14. The annular seal 617 may include a flange portion 654 to engage the outer surface 62 of the seal spring 60. Alternatively, the flange portion 6 5 4 may be connected to the inner surface 61 of the sealing spring 6 by the principle similar to that shown in FIG. 5 or the inner surface 61 and the outer surface 6 to be similar to the principle shown in FIG. 6. 2 Both. In any case, the annular seal 617 may engage enough seal spring 60 to limit and / or prevent the seal spring 60 from contacting one or both of the shaft bushing 50 and the plunger 丨 4. 490535 Case No. 87115582 Month _ Amendment V. Description of Invention (10) So far, it has been illustrated and explained an improved high-pressure fluid seal assembly. As can be seen from the foregoing, although specific embodiments of the present invention have been described for illustrative purposes, we can make many different modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described herein, but is defined by the scope of patent application below.

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Claims (1)

490535 Case No. 87115582% "Monthly amendments 6. Application scope 1. A high-pressure fluid-tight cylinder with an elongated plunger and a spring whose outer surface is opposite to the inner surface with a seal adjacent to at least one Partial spring lateral movement; and The seal assembly includes: a cylinder wall with at least one opening; passing through the opening of the cylinder wall; around the plunger and having an inner surface facing the plunger; and the curve 2. having a joint extension 0 4. for complex Surrounding a retaining member, the spring is biased toward the seal as claimed in the patent application, and the joint surface is a wire diameter as in the patent application range, and this surface is approximately equal to the outer surface of the spring with the wire as in the patent application number. If the scope of the patent application is at the end and the seal engages the spring, the retaining member is placed on the column, and the biasing spring faces the seal. For example, the scope of the patent application includes the following: 6. A sealing surface abuts the plunger and an outer surface of the engaging surface to limit the spring to the plunger located around the plunger and engage with the spring and limit the lateral displacement of the spring. The assembly of item 1, wherein the outer surface of the spring is curved and concentric with the outer surface of the spring. The assembly of item 1, wherein the spring comprises a thread wrapped around a spool, and a half of the diameter of the sealed joint extends along the axis of the assembly of item 1, wherein one of the sealed joint surfaces, each joint The surface is spaced apart from the assembly of item 1, wherein the spring has a first and the spring faces the first end, the assembly further encloses the vicinity and the engaging spring faces the second end of the assembly of item 5, wherein the maintaining member has a O: \ 55 \ 55029.ptc Page 1 2001.04. 27.016 490535 _Case No. 87115582_Year Month Amendment_ ^ Sixth, the scope of the application for a patent, the joint surface, the outer surface of the joint spring faces the second end of the spring ' The plunger moves sideways. 7. A high-pressure fluid seal assembly comprising: a cylinder having a cylinder wall together with at least one opening; an elongated plunger passing through the opening of the cylinder wall; a spring surrounding the plunger and having an inner surface Facing the plunger and an outer surface opposite the inner surface; a seal having a sealing surface abutting the plunger, the seal having a joint surface at least close to at least one of the inner and outer surfaces of the spring to limit the spring's impact on the plunger Lateral movement; and a maintenance member located around the plunger and engaging the spring to bias the spring toward the seal and limit lateral displacement of the spring. 8. For the assembly of claim 7 in the scope of patent application, wherein the seal includes a seal body and a flange portion extending away from the seal body and concentric with the plunger, and the joint surface is one surface of the flange portion. 9. As for the assembly in the scope of patent application item 8, wherein the flange portion is spaced from the plunger, and the joint surface is adjacent to the outer surface of the spring. 10. The assembly as claimed in item 8 of the patent application, wherein the flange portion is adjacent to the plunger and the joint surface is adjacent to the inner surface of the spring. 11. The assembly as claimed in claim 7 wherein the seal has a first engaging surface adjacent to the inner surface of the spring and a second engaging surface adjacent to the outer surface of the spring. 12. As for the assembly of the seventh scope of the patent application, one of the inner and outer surfaces of the spring is curved, and the seal has a curved joint surface O: \ 55 \ 55029.ptc Page 2 2001.04. 27.017 490535 _Case No. 87115582_ Year Month Amendment_ VI. Scope of patent application Adjacent to a surface of the spring, the joint surface and a surface of the spring are concentric. 13. The assembly as claimed in claim 7 in which the spring includes a wire having a wire diameter and wound around a wire spool, and the seal extends along the wire axis at a distance approximately equal to one-half of the wire diameter. 14. The assembly as claimed in item 7 of the patent application, wherein the spring comprises a wire wound at least twice around a wire spool to form two windings, and the joint surface engages the two windings of the spring. 15. The assembly of claim 7 wherein the spring has first and second ends and the sealing engagement spring faces the first end, and the assembly further includes a maintaining member disposed near the plunger and the engagement spring faces the first end. Both ends are sealed with bias springs. 16. The assembly as claimed in item 7 of the patent application scope, further comprising a retaining member having an engaging surface engaging the outer surface of the spring toward the second end of the spring to limit the lateral movement of the spring to the plunger, the retaining member further having an The penetration hole is spaced from the outer surface of the spring. 17. The assembly as claimed in item 7 of the patent application, wherein the seal includes a seal body and a flange extending away from the seal body and concentric with the plunger. The flange has an inner surface and an outer surface. The surface includes a joint surface and an outer surface of the joint spring. 18. For the assembly of claim 7 in the scope of patent application, wherein the joint surface is one of a plurality of joint surfaces, each joint surface is spaced from each other and engages at least one of the inner surface and the outer surface of the spring. 19. A high-pressure fluid seal assembly, the seal including an integral portion having a hole O: \ 55 \ 55029.ptc Page 3 2001.04. 27.018 490535 _ Case No. 87115582_ Year Month Amendment_ Sixth, the scope of the patent application allows the plunger to pass through, and the body is moved when the plunger moves axially through the hole Sealably engage the plunger, the body further has a flange portion protruding from one end of the body portion, the flange portion having an engaging surface engaging at least one inner surface and an outer surface of the spring and restricting the lateral movement of the spring to the plunger The inner surface of the spring faces the plunger, and the outer surface of the spring is opposite to the inner surface. 20. The assembly as claimed in claim 19, wherein at least one of the inner surface and the outer surface of the spring is curved, and the flange portion is curved and concentric with one surface of the spring. 21. The assembly as claimed in claim 19, wherein the joint surface is a first joint surface and is adjacent to the inner surface of the spring, and the flange portion further has a second joint surface spaced from and adjoining the first joint surface. Outside the spring. 22. The assembly of item 19 in the scope of patent application, wherein the spring comprises a wire having a wire diameter and wound around a wire axis, and the flange portion extends along the wire axis at a distance approximately equal to half the wire diameter. 2 3. The assembly of item 19 in the scope of patent application, wherein the flange portion includes a plurality of spaced protrusions adjacent to an inner surface and an outer surface of the spring. 2 4. A high-pressure fluid sealing assembly comprising: a sealing bracket having a penetrating hole through which a reciprocating plunger can pass, the sealing bracket having a first annular groove shared with the hole The center and a second annular groove are concentric with the hole and axially spaced from the first annular groove. An annular seal is installed in the first annular groove. The annular seal has a first end region and a second end. The area is opposite to the first end area, the first end area is supported by the sealing bracket, and the second end area has a flange since O: \ 55 \ 5502Lptc Page 4 2001.04. 27.019 490535 Case No. 87115582 Amendment VI. The scope of patent application is out of line and concentric with the hole; a spring with one end, the first end being biased against the torus to face the column The plug and an outer surface are opposed to the first-to-maintaining member of the spring. The first and second ends are opposite to the first seal. The spring further has an inner surface, and an inner end of the spring is engaged with the seal. The flange is placed in the vicinity of the plunger and the second end of the biasing spring is guided in an annular ring in an area. For example, apply for abutting springs. For example, if you apply for a single wire with a straight line diameter within one limit, between the groove 25. surface 26. surface 27. joint spring 28. with less wire 29. square; and the guide bearing is smaller than the Lee Fan inside the Lee Fan inner surface The surface abutment groove bearing is installed on the second ring of the sealing bracket: one inner diameter is in the inner diameter of the first annular groove and the hole of the second annular frame. The assembly of clause, wherein the flange has a joint sealing bracket 24th surface. Wall 24th surface. The assembly of the table item within the 24th item, wherein the flange has an assembly of the engaging item, wherein the flange has a surface and a second engaging surface abutting the assembly of the first range of the first item 24, wherein the spring contains A spool of silk is wound, and the flange extends along the spool approximately. A spring motion method that is placed at a distance of one-half a wire and placed near a plunger of a high-pressure fluid pump, the method includes: sealingly joining a tightly-sealed seal and spring to the seal and a plunger; at least one inner surface and Outer surface facing the spring O: \ 55 \ 55029.ptc Page 5 2001.04. 27. 020 490535 Case No. 87115582 Amendment 6 、 Applicable patent scope-First end, the inner surface faces the plunger and the outer surface faces away from the plunger; The plunger moves sideways. 30. The method of claim 29, wherein the action of engaging at least one of the inner and outer surfaces of the spring includes engaging a portion of a winding of the spring. 31. The method of claim 29, wherein the act of engaging at least one of the inner and outer surfaces of the spring includes engaging a portion of at least two windings of the spring. 3 2. The method according to item 29 of the scope of patent application, wherein the spring includes a wire having a wire diameter and wound around a wire spool, and the action of joining at least one of the inner and outer surfaces of the spring includes joining the wire not more than half the wire diameter a part. 33. The method of claim 29, wherein the spring has a second end opposite to the first end, the method further includes engaging at least one of the inner surface and the outer surface of the spring toward the second end of the spring to further limit the spring's resistance to The plunger moves sideways. 3 4. The method of claim 29, wherein the plunger extends into a cylinder, and the method further includes limiting the lateral movement of the spring against a wall of the cylinder. 35. The method according to item 29 of the scope of patent application, wherein the action of engaging the seal and the impeachment includes engaging one of the inner surface and one outer surface of the spring and the spring. O: \ 55 \ 55029.ptc Page 6 2001.04. 27. 021