RELATED TECHNICAL FIELD

The present invention relates to a double secured safety valve which is capable of providing gradual pressure relief facilitating the whole safety factor for the compressor, pressurized container, tank, vessel, etc. used with any kind of gas, air, water, hot oil, steam, etc. in the industry.

STATE OF THE ART

The safety valve is the means preventing the explosions due to the pressure by providing gas, air, and steam relief when the pressure has reached a predetermined level in the pressurized tank, container, vessels, etc.

The explosions of the pressurized tanks, vessels and containers may be seriously harmful to the areas where the pressurized containers are located and to those around and may even cause deadly consequences in some cases.

The explosions resulting from the pressure also cause the pressurized container and/or the system equipment to which it is integrated to be damaged seriously.

The function of the safety valve is to prevent the pressure increases to occur in the system by excluding the fluid from the system in the amounts to prevent the danger, in the cases of failure. The safety valves carries out this operation by a closing action based on the selected type after the opening function is completed for the evacuation according to the process of the system in which it is integrated. During the opening action of the safety valve the effect of the increasing pressure is detected and the springs having a spiral structure initiate the evacuation in response to this effect.

During this opening-closing actions of the safety valves, the pressure required for the system to maintain operating needs to be kept at the same level. Therefore, the safety valves are arranged so as to be opened and closed at the predetermined values. There are at least one or two safety valves in order to provide security on a pressurized tank, vessel, or container. This is because in the case of any problem at one of the safety valves, the other continues to operate and the internal pressure is relieved. No matter which component of the safety valve is damaged in the currently preserved and required standards, the device should perfectly carry out its functions and the system should open at least 85% of the surface of the corresponding outlet in all cases. The safety valves need to automatically meet this condition without any connection to any external electronic device or human. Also, the safety valves should be sealed and closed in order to prevent the external interventions.

The current safety valves do not meet these standards. For example, a safety valve connected to the system with an operating pressure of 9 ATLI should be arranged as 10 ATLI. When the safety valve involved in the system if the internal pressure of the system reaches the value of 10 ATLI and intended for reducing the dangerous internal pressure level to the nominal value starts to open the surface to which it is connected upon the first reaction, the effect on the safety valve is reduced, but dangerous pressure level continues to increase before meeting the criteria of“opening the 85% of the surface”. This case leads longer reaction periods, energy losses during this time periods, and the dangerous working conditions.

On the other hand, the explosions due to the pressure may occur because both devices are broken down. One of the most important reasons of the breakdowns of the safety valves is that they are exposed to the metal fatigue process very quickly because the spiral spring comprised in their structure operates in continuous pressure and at high temperatures.

Currently, there are safety valves used with dish springs. The invention“ anak yayli emniyet ventili” with no. 2010/02555 is an example of these arrangements. In said invention, the opening and closing action is enabled by dish springs instead of the spiral springs. However, in said invention, a safety valve which is capable of performing the pressure relief by only a single step is disclosed.

Also, the calcification and corrosion due to the water vapor and gases causes deformation of both the spiral spring and all stationary and moving components in the system, and prevents the components to work efficiently. THE OBJECT OF THE INVENTION

The object of the present invention is to relieve the pressure created according to the desired pressure value determined previously in all pressurized containers, tanks, and vessels as the first safety step, and as the second safety step, to provide maximum safety, without the need for the additional safety elements such as emergency relief valve, air ejector pin (ring), lever valve, etc., by urgently stopping the system to which the pressurized container, vessel, or tank is connected and by interrupting the main line creating the pressure, when there is a possible breakdown or an interruption of the mechanic signal (breaking or crushing of a cable).

Another object of the invention is to eliminate the breakdowns arising from the spiral spring because it comprises disc spring instead of spiral spring.

DESCRIPTION OF THE DRAWINGS

Fig. 1. The cross-sectional view of the double secured safety valve

Fig. 2. The cross-sectional view of the double secured safety valve in the case of pressure relief

Fig. 3. The cross-sectional view of the double secured safety valve providing two-step pressure relief, in the case of pressure relief

Fig. 4. The cross-sectional view of the mechanic contact safety unit

Fig. 5. The cross-sectional view of the pressure relief unit

Fig. 6. The cross-sectional view of the initial pressure relief unit

REFERENCE NUMERALS IN THE DRAWINGS

1 . Body

2. Cap

3. Connection member

4. Pressure feed inlet

5. Pressure outlet

6. Mechanic contact safety unit

6.1. Contact pin 6.2. Contact spring

6.3. Mechanic contact

6.4. Mechanic contact cap

7. Pressure relief unit

7.1. Flap

7.2. Shaft

7.3. Disc spring

7.4. Ring

7.5. Seat

7.6. Nut

7.7. Washer

7.8. Bellows

8. Initial pressure relief unit

8.1. Initial pressure relief flap

8.2. Initial pressure relief shaft

8.3. Initial pressure relief disc spring

8.4. Initial pressure relief ring

8.5. Initial pressure relief seat

8.6. Initial pressure relief washer

8.7. Initial pressure relief bellows

8.8. Initial pressure relief pilot

DESCRIPTION OF THE INVENTION

The safety valve of the invention has the pressure feed inlet (4) through which the pressure enters the safety valve by providing the double secured stage in which the pressure is relieved and in the case of a system failure, the main line relieving the pressure is interrupted in all pressurized containers; the pressure outlet (5) through which the pressure is evacuated from the safety valve; the body (1 ) constituting the main frame of the safety valve; the cap (2) preventing the pressure exiting through the pressure outlet (5) to reach other areas; the connection members (3) providing the connection between the components of the safety valve; the seat (7.5) through which the pressure coming from the pressure feed inlet (4) passes such that the pressure relieving process will be performed if the pressure reaches a predetermined pressure value; the flap (7.1 ) located at the seat (7.5) and providing the pressure relief by an opening and closing action by means of the pushing force of the pressure passing through the seat (7.5); the shaft (7.2) moving together with the flap (7.1 ) secured on it; the ring (7.4) enabling the flap (7.1 ) to be secured onto the shaft (7.2); the nut (7.6) in which the shaft (7.2) moves vertically; the disc springs (7.3) located around the shaft (7.2) and being closed by the pushing action of the flap (7.1 ) in order to allow the pressure to move towards the pressure outlet (5) such that the flap (7.1 ) leaves the seat (7.5) when the pressure reaches the predetermined value; the washers (7.7) located between the nut (7.6) and disc springs (7.3); at least one pressure relief unit (7) having the bellows functioning as a sheath to protect the components located therein from the pressure; the contact pin (6.1 ) contacting the shaft (7.2) moving upwardly together with the flap (7.1 ) for stopping the main line creating pressure in order to interrupt the pressure feed if a failure of the system or an interruption of the mechanic signal occurs; the mechanic contact (6.3) pushing the contact springs located thereon by the upward movement of the contact pin (6.1 ) so as to contact the main line contact to interrupt the main line creating pressure; and the mechanic contact safety unit (6) having the sealed mechanic contact cap (6.4) providing the protection of the components.

Within the safety valve of the invention, the movement direction of the pressure is from the pressure feed inlet (4) towards the pressure outlet (5) as shown in Figure 2.

The body (1 ), cap (2), and the mechanic contact cap (6.4) of the safety valve are attached to each other by the connection members (3). In the present invention, the bolts are used as the connection members (3).

The body (1 ) constituting the main frame of the safety valve also bears the seat (7.5). The flap (7.1 ) positioned on the seat (7.5) is opened and closed optionally and enables the pressure relief. The flap (7.1 ) is secured at the shaft (7.2) by means of the ring (7.4), therefore enabling them to act together. The shaft (7.2) moves vertically in the nut (7.6).

The pressure relief unit (7) may comprise the disc springs (7.3) with appropriate number and sizes for the system and the chamber to which the safety valve will be applied. The disc springs (7.3) are aligned on the shaft (7.2), and the washers (7.7) are located between the disc springs (7.3) and the nut (7.6). The pressure coming from the system chamber located on the body (1 ) passes through the seat (7.5) and applies a pushing force against the flap (7.1 ). When the arriving pressure reaches the predetermined pressure, the flap (7.1 ) compresses the disc springs (7.3) aligned around the shaft (7.2) and the disc springs (7.3) allows the flap

(7.1 ) to move upward by being closed in one step. Meanwhile, the flap (7.1 ) leaves the seat (7.5) on which it is situated, opens the relief path of the pressure, and the pressure is relieved through the pressure outlet (5).

While the pressure is relieved in said manner, the shaft (7.2) moving upward together with the flap (7.1 ) upon the closure of the disc spring (7.3) contacts the contact pin (6.1 ) and pushes the contact pin (6.1 ) upwardly. By the upward movement of the contact pin

(6.1 ), the contact springs (6.2) move upwardly and create a mechanic signal such that the mechanic contact (6.3) stops all the activities of the main system which creates the pressure. Thus, the main system creating the pressure is stopped and the pressure supply is interrupted until the system is fixed.

When the pressure is relieved to reach the pressure value in the pressure chamber integrated with the safety valve, the disc springs (7.3) that are closed by the pushing action of the shaft (7.2) are opened in one step, the flap (7.1 ) moves downwardly together with the shaft (7.2) and located on the seat (7.5) again, therefore the safety valve returns to its initial position in which the external environment and the internal environment are separated.

During the relief, the pressure is circulated within the safety valve. The disc springs (7.3), the shaft (7.2), the ring (7.4), the washer (7.7), and the nut (7.6) are located in the bellows (7.8) of the relief unit (7). The bellows (7.8) are secured onto the cap (2) and the flap (7.1 ) through the washers (7.7) and they are opened and closed so as to be adapted to the upward and downward movement of the flap (7.1 ). Therefore, the components of the relief unit (7) does not effected by the pressure circulation within the safety valve during the pressure relief and the deformations such as calcification, corrosion, etc. due to the contact with the pressure does not occur.

The safety valve of the invention enables a two-step security by means of the mechanic contact safety unit (6) and the pressure relief unit (7). The safety valve of the invention may comprise more than one pressure relief unit (7) such that it carries out gradual pressure relief in cooperation with the mechanic contact safety unit (6) to stop the main line creating pressure in order to interrupt the pressure feed in the case of a failure in the system or an interruption in the mechanic signal. In an example according to the present invention, a safety valve is applied which enables the pressure relief in two steps, one of which comprising the initial pressure relief unit (8) realizing the pressure relief as a preliminary safety in the predetermined initial pressure value when it faces the minimum opening pressure to affect the system, and the other comprising the pressure relief unit (7) conducting the main pressure relief by an exact opening action when a regular or irregular pressure comes to the system.

In order to facilitate the pressure relief as a preliminary security in the predetermined initial pressure value when it faces the minimum opening pressure to affect the system, the initial relief unit (8) of the safety valve providing two-step pressure relief as stated above comprises the initial pressure relief pilot (8.8) constituting the part where the pressure is relieved from the initial relief unit (8); the initial pressure relief seat (8.5) through which the pressure from the pressure feed inlet (4) passes; the initial pressure relief flap (8.1 ) located on the initial relief seat (8.5), facilitating the pressure relief by opening and closing action by the pushing force of the pressure passing through the initial pressure relief seat (8.5), and connected to the shaft (7.2); the initial pressure relief shaft (8.2) moving together with the initial pressure relief flap (8.1 ) secured on it; the initial pressure relief ring (8.4) enabling the initial pressure relief flap (8.1 ) to be secured to the initial pressure relief shaft (8.2); the initial pressure relief disc springs (8.3) located around the initial pressure relief shaft (8.2), being closed by the pushing force of the initial pressure relief flap (8.1 ) in order to enable the pressure to move towards the initial pressure relief pilot (8.8) upon the initial pressure relief flap (8.1 ) leaves the initial pressure relief seat (8.5) when the predetermined pressure is reached ί the initial pressure relief washers (8.6) located between the initial pressure relief disc springs (8.3); and the initial pressure relief bellows (8.7) functioning as a sheath for protecting the components therein.

The bellows (7.8) comprised by the relief unit (7) and the initial pressure relief bellows (8.7) comprised by the initial relief unit (8) may be of the heat-resistant silicon rubber, plastic, or stainless inconel 625 (nickel, chromium, and molybdenum). The initial relief unit (8) may comprise the initial pressure relief disc springs (8.3) with appropriate number and sizes for the system and the chamber to which the safety valve will be applied.

When the safety valve of the invention has two pressure relief units, one of which is an initial pressure relief unit and the other is the main pressure relief unit, the safety valve relieves the pressure from the initial pressure relief pilot (8.8) through the initial pressure relief unit (8) as the first security step when the minimum opening pressure is introduced to affect the system. When the pressure is introduced whether regular or not, it relieves the whole pressure in one time and by an exact opening action from the system by means of the main pressure relief unit, which is the second security stage. During the pressure relief operation of the relief unit, the mechanic contact safety unit (6) simultaneously stops the main pressure creator providing pressure to the system. Thus, the safety valve provides the system to which it is integrated and which is operating with the pressure integrated with a two-step pressure relief and double security.

The safety valve of the invention may be applied to the pressurized containers such as vessels, tanks, pressure cooker, etc. which works with LPG, CNG, water, gas, air, hot oil, steam, etc. The safety valve may be produced according to the sizes of the pressure chamber to which it will be applied.