MX2007014536A - Pressure activated trap primer and water hammer combination - Google Patents

Abstract

A water hammer arrestor and drain trap primer valve includes a hollow pipe having a closed end, a discharging end, an inlet, an outlet port connected to said discharging end and attachable to plumbing tubing, an inlet port connectedto said inlet and attachable to plumbing tubing, an insert plug within said pipe positioned at said discharging end and at said inlet, said insert plug substantially tubular with opposing flats, and having a longitudinal cylindrical bore and a latitudinal threaded through bore, a port bolt within a portion of said insert plug and a portion of said inlet port, said port bolt substantially tubular and having a longitudinal cylindrical bore and a latitudinal through bore distributor aligned with the insert plug longitudinal cylindrical bore, and a check piston within said pipe and slidingly engageable with said insert plug and said outlet port wherein said check piston engages slidably responsive to water pressure changes at said inlet port.

Description

COMBINATION OF PRESSURE-ACTIVATED SIEVES AND ARIETE BLOW VALVE CROSS REFERENCE This application claims priority pursuant to the United States Non-Probate Request also pending Serial No. 11/131, 731, filed May 17, 2005.

TECHNICAL FIELD The present invention relates to water hammer suppressors and drain trap purge valves.

BACKGROUND OF THE INVENTION Water hammer is a common problem in domestic water systems of sanitary installations. The negative effects of water hammer include damage to pipes and pipe fittings due to vibration, shock, and physical displacement, as well as discomfort due to the strong noise generated. Existing solutions have relied on pressure regulators to control sudden increases in pressure or balance chimneys. Both have disadvantages. Pressure regulators require adjustments during installation and periodically after installation. The small spaces in the pressure regulators can be clogged by particles or accumulated mineral common in domestic water systems making them inoperable, or requiring screens or meshes. Pressure regulators designed for domestic water systems also do not operate fast enough to stop a water hammer event. Balance chimneys combined with check valves can help reduce water hammer, but balance chimneys impose significant space requirements and generally can not be located sufficiently close to each of the sources of water hammer events to prevent Pressure waves travel through the pipe system. Therefore, there is a need for a compact water hammer prevention device that is compact, simple, economical, virtually maintenance free, and self-washable, which can be installed in domestic piping systems near the source of events of water hammer. Drain trap purge valves are known in the art. Automatic drain trap purge valves carry small amounts of water to drain in order to maintain the hydraulic seal on the drain purge valves that prevent the sewer gases from leaking back through the drain pipes. Automatic drain trap purge valves work generally based on pressure fluctuations in domestic water supply systems. When the water pressure in the domestic water supply line drops due to the opening of a valve, such as a faucet or toilet drain, the drain trap purge valve circulates and carries water to the drain. However, the drain trap purge valves do not provide protection against water hammer. In addition, automatic drain trap purge valves tend to be vulnerable to leaks because they must conform to the anticipated pressure of the system - if the nominal pressure of the system persists below the preset pressure, then the siphon purge valves Pre-set automatic drainage can continuously carry water to the drain. Some drain trap purge valves have attempted to solve this leakage problem, but still lack the ability to protect against water hammer events. Therefore, there is a need for a drain trap purge valve that automatically adjusts to the varying pressures of the domestic water supply line, that is compact, simple, economical, virtually maintenance free and that provides protection against the water hammer. The currently known technique attempts to address this problem, but has not completely solved the problem. The following represents a list of the known related art: Reference: Awarded to: Date on which it was sent: U.S. Patent 6,152,164 Whiteside November 28, 2000 U.S. Patent 5,678,588 Perrot et al. October 21, 1997 U.S. Patent 5,287,877 Ackroyd February 22, 1994 U.S. Patent 5,263,508 Perrott November 23, 1993 U.S. Patent 4,497,337 Mosbrucker et al. February 5, 1985 US Patent 4,204,556 Sullivan May 27, 1980 US Patent 3,422,835 Watts December 20, 1965 US Patent 3,333,597 Sullivan November 5, 1964 US Patent 2,096,287 McDougall April 17, 1937 The teachings of each of the above citations (which by themselves do not incorporate essential material as a reference) are known related techniques. None of the foregoing inventions and patents, considered individually or in combination, appear to describe the present invention as claimed.

BRIEF DESCRIPTION OF THE INVENTION A water hammer suppressor and drain trap purge valve includes a hollow tube having a closed end, a discharge end, an inlet, an outlet port connected to said discharge end and engageable to a sanitary pipe, a input port connected to said inlet and attachable to sanitary pipe, an insert plug in said tube placed in said discharge end and said inlet, the insert plug is substantially tubular with opposite flat walls, and with a longitudinal cylindrical piercing and a latitudinal threaded through hole, a port bolt inside a portion of said insert plug and a portion of said inlet port, said substantially tubular port bolt with a longitudinal cylindrical bore and a latitudinal through hole distributor aligned with the bore longitudinal cylindrical of the insert plug, and a retaining piston inside said tube and which can be hooked slidingly engage with the insert plug and the outlet port where the retaining piston slidably engages in response to changes in water pressure at said inlet port. An air piston can be added by separating the air chamber from the incoming water to dampen the response due to smaller pressure fluctuations that do not count in water hammer. The addition of a bypass check valve improves performance for severe water hammer problems. The water hammer reducer capacity can be increased simply by lengthening the air chamber to provide greater expansion volume. A water hammer suppressor and a drain trap purge valve includes numerous advantages: a single apparatus reduces water hammer and purge drainage siphons; by discharging the water displaced to the drain, instead of returning it to the system piping, little or no return pressure wave is generated and the waterhammer effect ceases rapidly; able to act as a drain trap purge valve to prevent backflow of sewer gases through system drainage; carwash; few moving parts; the meshes at the entrance are unnecessary; and maintenance is substantially reduced. Additional advantages of the invention will be presented in part in the following description, and in part will be obvious from the description, or may be learned by practicing the invention. The advantages of the invention can be realized and achieved by means of the mechanisms and combinations indicated particularly in the appended claims. Further benefits and advantages of the embodiments of the present invention will become apparent upon consideration of the following detailed description which is given with reference to the accompanying drawings, which specify and show preferred embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated and constitute a part of the present specification, illustrate one or more embodiments of the present invention and together with the detailed description, serve to explain the principles and implementations of the invention.

Figure 1 shows a general schematic figure of an embodiment of the present invention installed in a typical domestic water system. Figure 2 shows an isometric view of one embodiment of the present invention. Figure 3 shows a lateral elevation of one embodiment of the present invention. Figure 4 shows an isometric exploded view of one embodiment of the present invention. Figure 5 shows an isometric exploded view of another embodiment of the present invention. Figure 6 shows a sectional view of an embodiment of the present invention. Figure 7 shows a partial section of another embodiment without the check valve. Figure 8 shows another partial section of another embodiment without a check valve or a piston. Figure 9 shows an embodiment of the present invention in its normal stasis position. Figure 10 shows an embodiment of the present invention discharging water. Figure 11 shows an embodiment of the present invention filled with water.

DETAILED DESCRIPTION OF THE INVENTION Before beginning a detailed description of the subject invention, it is necessary to make the following mention. Where appropriate, similar reference materials and characters are used to designate identical, corresponding or similar components in different drawings of the figures. The drawings of the figures associated with the present description are typically not drawn to scale with dimensional accuracy, ie, such drawings have been drawn with a focus on clarity of observation and understanding rather than dimensional accuracy. With interest in clarity, all routine features of the implementations described herein are not shown or described. Of course, it will be appreciated that in the development of any real implementation, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with restrictions related to the application and the business, and These specific goals will vary from one implementation to another and from one developer to another. In addition, it will be appreciated that said development effort could be complex and time-consuming, but would nevertheless be a routine engineering task for those of ordinary skill in the art counting on the benefit of the present disclosure. A water hammer suppressor and a siphon seal purge valve communicate with a variable pressure water supply line to automatically discharge water that will be carried to sewer line drainage siphons. An internal chamber containing air or other compressible gas forms the integral water hammer suppressor providing protection against the effects of water hammer and allows automatic water discharge whenever the device is subjected to pressure peaks or pressure drops. The internal retention mechanisms open to allow water to enter the valve by compressing the internal gas chamber. Once the chamber is compressed, a drop in the relative pressure on the supply side will close the retention mechanisms and direct water out of the discharge port. A waterhammer and a drain siphon purge valve 10 are provided and, as shown in FIGS. 1-11, includes a T-tube 12 of a hollow tube having a closed end 16, an end discharge 18, and an inlet 14, an outlet port 30 connected to said discharge end 18 and coupled to a sanitary pipe, an inlet port 22 connected to said inlet 14 and engageable to the sanitary pipe, an insert plug 60 ( or 200) in said tube 12 placed in said discharge end 18 and in the inlet 14, the insert plug 60 (or 200) is substantially tubular with opposite flat walls 68, and with a longitudinal cylindrical bore 72 and a threaded through hole latitudinal 64, a port 80 bolt in a portion of said insert plug 60 (or 200) and a portion of the inlet port 22, the port bolt 80 is substantially tubular and has a longitudinal cylindrical bore 88 and a latitudinal through hole distributor 92 aligned with the longitudinal cylindrical piercing of the insert plug 72, and a retaining piston 54 within said tube 12 and slidably engage with the insert plug 60 (or 200) and the outlet port 30 where the retaining piston 54 slidably engages in response to changes in water pressure at said inlet port 22. Figure 1 shows a typical installation of a water hammer suppressor and drain trap purge valve mode. 10 in a domestic water system. With reference to Figures 5, 8, together with Figures 1, 2, 3, 6 and 9-11, a water hammer suppressor and drainage siphon purge valve 10 includes, in a first embodiment, a tube in Vertical T 12 with a line inlet port 22 extending perpendicularly from the T-tube 12, and an outlet port 30 extending vertically downward from the T-tube 12. The T-tube 12 is a hollow tube , preferably copper, with open ends and a single side opening, the inlet 14, is sized to accept the inlet port 22. The inlet port 22 is welded in place with low melting solder, but could be captured by means of of high fusion welding, brazing, glue, twisting, or any other suitable means. A cover 24, preferably copper, provides a gas tight seal for the closed end of the T-tube by means of low melting solder. Alternatively, high melting, brazing, glueing, screwing, or any other suitable process could be used. Those skilled in the art know that there are several ways in which the closed end of a T-tube can be closed. The gas chamber 26 provides the compensation volume to absorb a sudden inrush of water caused by a water hammer event. , by absorbing the entire volume of the water intrusion, the invention can effectively eliminate the effect of water hammer. The absorption capacity of the gas chamber 26 can easily be increased by lengthening the vertical extension of the T-tube 12, in order to accommodate higher capacity sanitation systems or more severe water hammer problems. The discharge end 18 of the T-tube is connected to the threaded sleeve 42 by low melting welding. Alternatively, high melting, brazing, glueing, screwing, or any other suitable process could be used. The threaded sleeve 42 engages its external threads with the outlet port 30. The O-ring 44 of the threaded sleeve seals the internal wetting area of the threads of the threaded sleeve 42. The latching end 34 of the outlet port is provided with threads Inner ports that engage by screwing into the threaded sleeve 42. The outlet port 30 is provided with a small drainage hole 32 stuffed to accommodate the outlet seal 40, preferably Santoprene ™ The vacuum holes 38 are provided in the side walls of the port. outlet 30 to avoid the formation of vacuum in the drain line. The distal end of the outlet port 36 is a threaded compression fitting of 15.87 mm (5/8"), a standard size that is compatible with most domestic piping systems, which frictionally engages a copper tube of 1.27 mm (1/2") nominal that transports the discharge water to the stormwater culvert. Other sizes could be used depending on the need. The insert plug 60 is generally round with a diameter slightly smaller than the internal diameter of the T-tube 12. The insert plug 60 incorporates flat walls 68 which create channels 62 to allow the passage of water between the insert plug 60 and the plug 60. T-tube 12. Alternatively, the insert plug 60 could incorporate longitudinal ribs or an eccentric shape to provide channels for the passage of water. As shown in Figures 5 and 7, the insert plug 60 includes a closed upper portion distal to the outlet port 30 and a generally hollow lower portion with a vertically extending side wall 70 and an open end 71. Insert plug 60 further includes a threaded passage 64 bored perpendicularly through a diameter in its upper part and a vertical intersecting passage 72 of smaller diameter bored along the vertical axis of the lower face 66 of the insert plug 60. The vertical intersecting passage 72 extends to and forms the open end 71 (also shown in Figure 6). The threaded port bolt 80 engages the insert plug threaded passage 64. The port bolt 80 is generally a solid cylinder, with an external threaded diameter 84 slightly smaller than the initial diameter 82, creating a bolt shoulder 86. The distributor of port 92 bolt incorporates a reduced diameter to allow water distribution to the passage to the vertical intersection passage 72 without the need to align the bolt distributor of port 92. The threaded diameter port bolt 80 further includes an inlet passage 88 extending along the central axis to intersect the port bolt distributor 92. The entry passage 88 incorporates internal flat walls 90 to allow tightening, preferably with an Alien key. When the port bolt 80 is tightened the insert plug 60 is pulled tightly towards the inner wall of the T-tube 12 while the shoulder of the port bolt is pulled tightly against the inlet 14 to provide a watertight seal, as well as to provide a positive catch to keep the insert plug 60 in place. Any eccentricity in the vertical alignment in the insert plug 60 caused by this tightening is adapted by the conical face of the retaining piston 50 and the outlet seal 40. The retaining piston 54, with U-cup seal 52, is assembled within the vertically extending side wall 70. The retaining piston includes a conical face 50, an upper face 51, a lower face 53, and a rod 56. The piston rod retention 56 is slidably mounted within the intersecting vertical passage 72 and ending at an upper surface 57. As shown in Figure 9, the entry seal 48 is placed on the retaining piston 54 to provide a water-tight seal against the lower seal ring 46 in the open end of the insert plug 71 when the retaining piston 54 is raised to its upper position. The U-cup seal 52 is in contact with the inner wall of the vertical side walls of the insert plug 70 facing downwards, to allow the passage of water downwards during the elevation of the pressure conditions of the inlet line but avoiding the passage of water upwards beyond the cup seal at U 52 during the reduction of the pressure conditions of the inlet line. The U 52 cup seal may be an available U cup seal or some other suitable unidirectional seal. The conical face 50 engages the outer seal 40 when in the lower position to provide a watertight seal preventing water from being discharged through the outlet port 30 during an elevation in the pressure condition of the inlet line. In the operation, a first mode acts in the following manner. As the inlet line pressure rises, the water enters through the inlet passages 88 in the port bolt 80, is driven downward and distributed by means of the distributor 92 to act on the upper surface 57 of the retaining piston 54, causing the retaining piston 54 to rest on the outlet seal 40. In this way the water is driven down through the cup seal in U 52, which relieves pressure in this direction, where it flows through the gaps 62 into the gas chamber 26 to compress the gas volume. As the inlet line pressure is reduced below the gas volume pressure, the water in the gas chamber 26 is driven back down through the gaps 62. This water of higher pressure acts against the lower surface of the gas. retaining piston 54, and the U-cup seal 52, thereby causing the U-cup seal 52 to seal against the extension of the side wall of the insert plug 70 to prevent backflow, and by displacing the retaining piston 54. upwards. The upward displacement of the retaining piston 54 lifts it from the outlet seal 40 and causes the inlet seal 48 to bear against the lower seal ring 46, thereby causing the water to discharge through the outlet port 30 to the drain . When the pressure in the gas chamber 26 once again equalizes the pressure of the inlet line the retaining piston 54 returns to settle against the outlet seal 40. The through holes 38 are provided to prevent the formation of vacuum in the line of drainage which could avoid that the piston of retention opened properly, as well as avoid a contra siphon that could take water of drainage inside the sanitary pipe. The through holes 38 could provide means for visually inspecting the apparatus for leaks and for operation. The device acts additionally as a water trap siphon purge valve. Water is discharged to the drain during water hammer events as described above. The water is also discharged to the drain during low pressure events as follows: When the system pressure is in normal equilibrium, the water level inside the gas chamber 26 will remain essentially constant because the gas pressure is equalized to the pressure of the system. If the system pressure falls due to the activation of a load the gas pressure in the gas chamber 26 is greater than the system pressure, causing the retention piston 54 to rise allowing the gas pressure to drive the water to through the drain hole 32 and the outlet port 30, until the gas pressure again equals the system pressure, at which the retention piston 54 returns to settle. When the system pressure returns to normal, the water will expand into the gas chamber 26, until the pressure of the system stabilizes. No water will be discharged at this point, because the pressure in the gas chamber is equal to the pressure of the system, and the pressure of the system acts on the upper part of the retaining piston 54 so that it is seated against atmospheric pressure in the drainage line. With reference to Figure 7, together with Figures 1-4, 6, 9-11, a second embodiment is similarly assembled to the first embodiment described, but includes an air chamber piston 100 for separating the water in the upper chamber 102 of the gas in the gas chamber 26. The piston of the air chamber 100 incorporates raised protuberances 104 to provide gaps between the bottom face of the air piston 100 and the upper face of the inlet plug 60. Two o-rings lubricated 106, preferably of EPDM or nitrile, provide a seal between the volumes of water and gas. The inclusion of the air chamber 100 provides an improved damping effect in such a way that small fluctuations in the pressure of the inlet line will not cause the retention piston 54 to release partial discharges. The piston of the air chamber 100 also allows to charge the surge suppressor with gas that will not react adversely with the fluid in the sanitary system. For example, nitrogen or argon could be used for deoxygenated water systems or systems with potentially explosive vapors. Additionally, cleaning seals may be incorporated to protect the o-rings 106 from fragments. With reference to figures 4 and 6 together with figures 1-3, 9-11, a third embodiment is assembled similarly to the second embodiment described above. In this third embodiment, the insert plug 200 incorporates a vertical check valve 206, which is installed inside the upper passage 202 pierced in the upper part of the insert plug 200 in order to allow water to pass upwards to the chamber upper 102 during a rise in the pressure in the inlet line, but prevents the flow decrease from the upper chamber 102 during a decrease in inlet line pressure. The vertical check valve 206 may be a standard type check valve, such as Neoperl ™ OV 10-1 ™, manufactured by Neoperl, Inc., or any other suitable device to allow water to pass upwardly to the upper chamber 102 during the elevation of the inlet line pressure, but prevents downward flow from the upper chamber 102 during a lower pressure in the inlet line. During the reduction of the pressure conditions of the inlet line the vertical check valve 206 sits against the upper inlet port 208 to prevent downward water flow. The insert plug 200 extends distally from the outlet port 30 to provide a clear clearance for the installation of the vertical check valve 206.

In the operation this third modality operates in the following way. As the pressure of the inlet line rises, the water acts to lift the vertical check valve 206, allowing water to enter the upper chamber 102. The high pressure water in the upper chamber 102 acts on the piston face of the air chamber 100, moving the piston of the air chamber 100 upwards to compress the gas inside the gas chamber, until the pressure in the piston coincides with the water pressure of the inlet line. Simultaneously, the high pressure of the inlet water acts directly on the retaining piston 54 to seat it against the outlet seal 40 thereby preventing the water from discharging through the outlet port 30 until after the pressure wave arrives at the outlet port 30. a maximum peak. As the pressure in the inlet line drops after a water hammer pressure peak, the gas pressure in the gas chamber 26 is now greater than the inlet line pressure, which pushes water into the upper chamber 102. down, acting in this manner to seat the vertical check valve 206 against the upper inlet port 208. As the vertical check valve is seated the water is driven to flow down through the channels 62 to act on the face lower 53 of the retaining piston 54. At this point the water acting on the lower face 53 of the retaining piston 54 is at a higher pressure than the water acting on the upper face of the retaining piston 54 (which is under pressure of the inlet line), thereby driving the retention piston 54 upwards, lifting it from the outlet seal 40, and allowing water from the upper chamber 102 to discharge through the outlet port. 30. When the air piston 100 returns to its normal stasis position, the water pressure inside the valve is equalized, and the retention piston 54 returns to settle against the outlet seal 40. The present invention seeks to solve problems both of the water hammer suppressor and of draining drain siphons with a single device. When a water hammer event occurs the pressure wave causes the water to rise entering a chamber filled with air, compressing the compressed air. Because water is an incompressible fluid, a small increase in volume causes a rapid decrease in pressure. Allowing the water to move against the air pressure increases the volume of the system, thus rapidly decreasing system pressure, and raising air pressure. A piston acts as a check valve to prevent water from the port from draining during the lifting portion of the pressure wave, but allows high pressure water to rise freely inside the air chamber. When the pressure of the inlet line begins to decrease, after the pressure peak, the compressed air is at a higher pressure than the pressure in the inlet line. This difference in pressure causes the retaining piston 54 to move upwards, opening the drain port but sealing the inlet port in such a way that the water displaced inside the air chamber is driven out by the air pressure in the drain port. When the pressure in the air chamber drops to the system pressure, the retention piston returns to its lower position sealing the discharge port, held in place by the pressure of the system against the atmospheric pressure in the drain line. Holes are provided in the discharge port to vent the drainage to the atmosphere, preventing vacuum buildup and providing a means to inspect the valve for leaks and operation. By discharging the water displaced to the drain, instead of returning it to the system piping, few to no pressure waves are generated and the waterhammer effect ceases rapidly. In addition, the pressure oscillations caused by the opening and closing of valves, or by decreasing and intentionally increasing system pressure, will cause water to be discharged through the valve thus maintaining sufficient water in the sewer drain siphon to prevent backflow of sewer gases through system drains . The mechanical construction of this device can vary widely without departing from the control principle described herein. Alternative materials may be used, depending on manufacturing capacity, price and fluid compatibility considerations. For example, the parts can be machined from copper, brass, stainless steel, titanium, or other suitable metals. Alternatively, the parts can be made of polyvinyl chloride (PVC), polyvinyl difluoride (PCDF), perfluoroalkoxy (PFA), machined or injection molded, or other suitable plastics.

Seals and O-rings made of self-lubricating plastics such as Teflon ™ and Delrin ™ can be used to extend the life of the parts. Those skilled in the art will recognize that numerous modifications and changes can be made to the preferred embodiment without departing from the scope of the claimed invention. Of course, it will be understood that modifications of the invention will be evident to those with experience in the art, being some evident only after a study, being other subjects of mechanical, chemical and electrical routine design. Not a single feature, function or property of the preferred embodiment is essential. Other modalities are possible, depending on their specific designs of the particular application. As such, the scope of the invention should not be limited by the particular embodiments described herein but should be defined only by the appended claims and their equivalents.

Claims (10)

NOVELTY OF THE INVENTION CLAIMS

1. - A water hammer suppressor and drain trap purge valve, comprising: a hollow tube having a closed end, a discharge end, an inlet; an outlet port connected to said discharge end and coupled to a sanitary pipe; an input port connected to said inlet and connectable to sanitary piping; an insert plug in said tube placed in said discharge end and said inlet, the insert plug is substantially tubular with opposite flat walls, and with a longitudinal cylindrical bore and a latitudinal threaded through bore; a port bolt within a portion of said insert plug and a portion of said inlet port, said substantially tubular port bolt and with a longitudinal cylindrical bore and a latitudinal through hole distributor aligned with the longitudinal cylindrical bore of the plug insert and a retaining piston within said tube and that can be slidably engaged with the insert plug and the outlet port wherein the retaining piston slidably engages in response to changes in water pressure at said port. entry.

2. The apparatus according to claim 1, further characterized in that it additionally comprises an air piston inside said tube placed between said insert plug and said closed end.

3. The apparatus according to claim 1, further characterized in that it additionally comprises a check valve placed inside said insert plug located distally in relation to the discharge end of the tube.

4. A water hammer suppressor and drain trap purge valve, comprising: receiving means for receiving water under pressure; distribution means for distributing water under pressure through a pipe system; means that respond to the pressure to accept distributed water and when changing the pressure to channel distributed water; and discharge means for discharging distributed water from the media responding to the pressure. 5.- A water hammer suppressor and drainage siphon purge valve, comprising: an inlet connected to a sanitary piping system, an outlet connected to the drain, and an expansion chamber; a one-way sealing means that allows water to flow from the inlet to the expansion chamber when the inlet water pressure rises compared to the pressure of the gas within said expansion chamber; a one-way water-tight sealing means that allows water to flow from said expansion chamber to said outlet when the inlet water pressure decreases in comparison with the pressure of the gas within said expansion chamber; such that: when the pressure of the inlet fluid rises above the pressure of the gas within said expansion chamber, the second one-way sealing means seals said inlet and said expansion chamber of said outlet, resulting in fluid high pressure flow inside the expansion chamber compressing the volume of gas; and when the inlet fluid pressure subsequently drops, the compressed gas in said expansion chamber expands, causing said first water-tight sealing means to seal said expansion chamber of said inlet, further causing said second water-tight sealing means. open, thereby pushing the fluid from the expansion chamber to the drain; until the pressure of the gas inside said expansion chamber is satisfied by the pressure of the system. 6. A water hammer suppressor and drainage siphon purge valve, comprising: a water receiving means for connecting to an existing sanitary system and a sanitary line to a siphon seal; a means of discharging water to connect to a sanitary line to a siphon seal; a water pressure distribution means attached to, and in fluid communication with, said water receiver means for receiving and distributing pressurized water; and a siphon seal purge means attached to, and in communication with, the water pressure distribution means and the water discharge means for purging a siphon by receiving water distributed from said water pressure distribution means and discharging said water distributed to a siphon to purge. 7. A water hammer suppressor and drainage siphon purge valve, comprising: a lateral inlet connectable to a sanitary piping system, a lower outlet coupled to a sanitary sewer trap, and an expansion chamber located on said side entrance and said lower exit; a distributor interposed between, and in fluid communication with, each of the side entrance, the lower exit and the expansion chamber, said distributor including an internal channel and one or more external channels; a retaining piston in said internal channel of the distributor disposed between said lateral inlet and said lower outlet, said piston including a one-way seal allowing flow from said internal channel to said external channels; wherein the pressure of the sanitary piping system exceeds the pressure of the gas in said expansion chamber, the retaining piston sits against the lower outlet, and the one-way seal allows water to flow from said internal channel to said chamber of expansion via said external channels, thus reducing the pressure in said sanitary piping system, trapping a volume of water; and wherein additionally, when the pressure of the sanitary piping system decreases to less than the gas pressure of the expansion chamber, said retention piston sits against said internal channel, sending said volume of water received exclusively to said lower outlet via the external channels. 8. The water hammer suppressor and drain trap purge valve, according to claim 7, further characterized in that it further comprises: a means of check valve in said distributor, said check valve in fluid communication with the side entrance and said expansion chamber, said check valve allowing the rapid flow from said inlet to said expansion chamber and blocking the flow of fluid from said expansion chamber to said entrance. 9. The water hammer suppressor and drain trap purge valve, according to claim 7 or 8, further characterized in that it additionally comprises: a piston disposed within said expansion chamber, said piston separating the gas portion of the liquid surface in said expansion chamber. 10.- A water hammer suppressor and drainage siphon purge valve, comprising: an entrance that can be coupled to a sanitary system; an expansion chamber above said entrance; an exit below said entrance; said outlet coupled to a drainage siphon of the sanitary system; a first means of check valve between said inlet and the expansion chamber allowing a rapid flow entry due to a water pressure event, but avoiding the flow of the expansion chamber towards the inlet; a second means of check valve between said expansion chamber and said outlet; in such a way that when the fluid pressure in said inlet rises above the gas pressure in said expansion chamber as in a water hammer event, the first check valve means allows the inflow of water to the expansion chamber, thereby reducing the pressure of the sanitary system caused by a water hammer event, and wherein additionally, said second valve means prevents the flow from said expansion chamber to said outlet; and in such a way that when the pressure of the fluid in said inlet falls below the gas pressure, said first check valve prevents the flow return of said expansion chamber towards said inlet and said second means of check valve allows the water flow from said expansion chamber towards said outlet, thus directing the water received during a water hammer event to the drainage and avoiding a reflected water hammer event.