【Daily Question 20090228】Selection of pressure gauge gaskets

For low-pressure environments, tetrafluoride can be used; for medium-pressure environments, aluminum can be used; for high-pressure environments, steel is used. Copper cannot be used for oils. For special media, compatibility between the medium and the gasket must be taken into consideration

We use asbestos rubber and red copper.

Pressure, medium, and temperature should be the main factors to consider. We use 4F quite often; for high-temperature environments, copper is used

This issue has already been discussed: http://bbs.hcbbs.com/viewthread.php?tid=396992&highlight=%B0%B2%D7%B0%D1%B9%C1%A6%B1%ED%CA%B1%A3%AC%C8%E7%BA%CE%D1%A1%D3%C3%C3%DC%B7%E2%B5%E6%C6%AC

When the medium under test is at temperatures below 80°C and pressures of 2 MPa, rubber gaskets can be used； When the temperature is below 450°C and the pressure is below 5 MPa, asbestos or lead gaskets can be used ； At higher temperatures and pressures, annealed copper or aluminum gaskets can be used ； When measuring oxygen pressure, oil-immersed gaskets or organic compound gaskets must not be used ； Copper gaskets must not be used when measuring acetylene pressure. When the medium under test is below 100°C and 1 MPa, a PTFE gasket can be used.

Gaskets should be selected based on factors such as the temperature of the medium, pressure level, and corrosivity: 1. Asbestos rubber 2. Fluoroplastics 3. Aluminum. For details, refer to the automatic control installation manual HG/T21518-95 HK 02. This post was last edited by Meihua Piaoxiang on 2009-2-28 at 13:12

This is a good question. When the temperature of the medium being measured is below 80°C and the pressure is below 2 MPa, leather or rubber gaskets can be used. When the temperature is below 450°C and the pressure is below 5 MPa, asbestos or lead gaskets can be employed. For higher temperatures and pressures, annealed copper or aluminum gaskets can be used; for example, in the case of steam. When measuring oxygen pressure, oil-impregnated gaskets or gaskets made of organic compounds should not be used. When measuring acetylene pressure, copper gaskets must not be used. When the medium under test is at temperatures below 100°C and pressures below 1 MPa, PTFE gaskets can be used. For diaphragm pressure gauges, PTFE flat gaskets or concave gaskets can be employed (to prevent pressure from being applied to the gauge diaphragm). Note: Gaskets are not required for NPT connections

When the temperature and pressure of the medium being measured are below 80°C and 2 MPa, rubber gaskets can be used; when they are below 450°C and 5 MPa, asbestos or lead gaskets can be employed. For higher temperatures and pressures, annealed copper or aluminum gaskets can be used, as in the case of steam. When the temperature and pressure of the medium being measured are below 100°C and 1 MPa, PTFE gaskets can be used

Rubber gasket (when the medium under test is below 80°C and 2 MPa)； Asbestos gasket (below 450°C and 5 MPa) ； Aluminum gasket (other cases)

When the medium under test is at temperatures below 80°C and pressures of 2 MPa, leather or rubber gaskets can be used； When the temperature is below 450°C and the pressure is below 5 MPa, asbestos or lead gaskets can be used ； At higher temperatures and pressures, annealed copper or aluminum gaskets can be used. When measuring oxygen pressure, oil-immersed gaskets or organic compound gaskets must not be used ； Copper gaskets must not be used when measuring acetylene pressure. Because they all pose a risk of exploding.

HaiChuan has such a post that is quite comprehensive; it can be considered an answer. The address is as follows: http://bbs.hcbbs.com/thread-149970-1-1.html

I don’t know how to answer, but I think the choice should be based on factors such as the nature of the fluid being transported, as well as pressure and temperature. Generally, I’ve seen those white ones made of PTFE rubber, as well as copper gaskets.

Asbestos rubber and fluoroplastics are used more frequently

We don’t have high temperatures or pressures here; generally, PTFE gaskets are used, as well as copper gaskets.

From Network ①: When the temperature of the medium under test is below 80°C and the pressure is below 2 MPa, rubber gaskets or seals can be used； When the temperature is below 450°C and the pressure is below 5 MPa, asbestos or lead gaskets can be used ； At higher temperatures and pressures, annealed copper or aluminum gaskets can be used. ②When measuring oxygen pressure, oil-immersed gaskets or organic compound gaskets must not be used ； Copper gaskets must not be used when measuring acetylene pressure. Because they all pose a risk of exploding.