Manual stop valve brief introduction
- Dec 16, 2017 -

Manual stop valve stem axis and seat sealing surface are perpendicular. Making this valve is very suitable as a medium cut off or adjust and throttle use. This type of valve in the pipeline should be generally horizontal installation. The company is located in:


Manual stop valve details

Nominal diameter: DN15-DN250

Pressure range: 1.6-6.4mpa

Medium temperature: -40 degrees -450 degrees

Connection: flange, thread

Function Options: switch, adjust

Drive mode: manual, worm gear, pneumatic, electric


Manual stop valve stem axis and seat sealing surface are perpendicular. Making this valve is very suitable as a medium cut off or adjust and throttle use. This type of valve in the pipeline should be generally horizontal installation.


Features

(1) The structure is simpler than the gate valve, which is more convenient to manufacture and maintain.

(2) The sealing surface is not easy to wear and abrasion, good sealing, no relative sliding between the valve flap and sealing surface during opening and closing, so the abrasion and abrasion are not serious, the sealing performance is good and the service life is long.

(3) When opening and closing, the valve stroke is small, so the cut-off valve height is smaller than the gate valve, but the structure length is longer than the gate valve.

(4) large opening and closing torque, hoist more effort, opening and closing time principal.

(5) large fluid resistance, due to the media channel tortuous body, fluid resistance, power consumption.

(6) When the nominal pressure of medium flow direction is PN≤16MPa, it is generally used downstream and the medium flows upward from the valve flap. When the nominal pressure is PN≥20MPa, the countercurrent is generally used, and the medium flows downward from the valve flap. To increase the seal can. When used, the globe valve medium can only flow in one direction, can not change the flow direction.

(7) When the valve is fully open erosion.

Stem axis and seat sealing surface perpendicular. Stem opening or closing stroke is relatively short, and has a good cut off action, making this valve is very suitable as a medium cut off or adjust and throttle use.

Once the valve of the manual shut-off valve is open, its contact between the valve seat and the valve sealing surface is no longer in contact with the shut-off valve, and has a reliable shut-off action. This type of valve is very suitable as a medium for cutting or adjusting Flow use.


Selection principle

1. high temperature, high pressure medium pipe or device should choose the globe valve. Such as thermal power plants, nuclear power plants, petrochemical systems of high temperature and high pressure on the pipeline.

2. on the pipeline convection resistance requirements of the pipeline. That is, the pressure loss is not taken into account.

3. small valve optional needle valve, instrument valve, sampling valve, pressure gauge valve.

4. a flow adjustment or pressure regulation, but less demanding on the regulation accuracy, and the pipeline diameter is relatively small, such as nominal pass through less than or equal to 50 mm of the pipeline, should be used.

5. synthetic industrial production of small fertilizers and large chemical fertilizer should use nominal pressure PN160 Nominal pressure 16 MPa or PN320 Nominal pressure 32 MPa high-pressure angle type globe valve or high-pressure angle throttle.

6. Alumina Bayer process in the production of desiliconization workshop, easy coking pipe, easy to choose the valve body separate, seat can be place, the sealing of the cemented carbide DC globe valve or DC throttle.

7. urban construction in the water supply and heating projects, the nominal pass through the smaller pipe, the choice of cut-off, counterbalance valve or plunger valve, such as the nominal pass through less than 150 mm of the pipeline. The most obvious advantage is that during the opening and closing process, the valve plate is wearable because of the lower friction between the sealing surfaces of the valve body and the gate valve.


Selection of different materials, can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media.