What Is a Dump Valve?

The blowdown valve is evolved from the gate. The rotation of the gear by 90 degrees drives the valve stem to lift to achieve the purpose of opening and closing. Small torque, easy operation and quick opening and closing.

Quick blowdown valve

Right!

The blowdown valve is evolved from the gate and is driven by the gear rotating 90 degrees

1. The valve body and bonnet are connected by a clamp, which has a compact structure, convenient disassembly, and easy installation. The branch pipe is welded.

2. Adopt pressure self-tightening sealing structure. The sealing ring is made of asbestos packing. The higher the medium pressure, the better the sealing performance.

3. The medium flows from the branch pipe and drains downwards.

4. The valve disc is a piston structure and is boronized. Resistant to corrosion and erosion. long lasting.

Multi-way blowdown valves must be installed vertically on horizontal pipes. The valve should not be installed until the pipes have been cleaned.

1. Turn the handwheel valve stem counterclockwise to drive the valve core gradually upward, the sealing surface is disengaged, and the deflector seat on the valve core gradually moves out of the inner hole of the valve seat, forming a narrow gap, and the medium passes through the symmetrical throttle hole on the valve seat. Entering the valve seat, a small amount of medium can flow out through the slit, gradually reducing the system pressure.

2. Continue to turn the handwheel counterclockwise, the valve core moves upwards, the orifice on the guide seat moves out of the valve seat cavity, and more medium is smoothly discharged through the guide seat and the valve sleeve.

3. Continue to turn the handwheel counterclockwise, and the valve core moves up to the fully open position. At this time, the pressure of the medium is greatly reduced, and a large amount of impurities can be directly discharged from the orifice of the valve sleeve, and a vortex is formed at the inverted seal seat. Clean the sealing surface to prevent impurities from adhering to the sealing surface.

4. Rotate the valve clockwise, the valve stem moves the valve core downward. At this time, the drainage has ended, the system pressure is low, the area of the orifice on the valve sleeve is gradually reduced, the guide sleeve is close to the valve seat, and the medium flow direction is changed. After the throttling, the sealing surface is passed through the valve core and the valve at a certain speed, and the cleaning strength of the sealing surface is gradually strengthened.

5. Continue to turn the handwheel, the deflector seat on the valve core enters the inner hole of the valve seat, forming a narrow throttling. Because the sewage is nearing the end, there are fewer impurities in the medium, and the narrow gap between the guide sleeve and the valve seat prevents the remaining The small impurities flow into the sealing surface, and the medium quickly flows out through the narrow gap, thoroughly cleaning the sealing surface, and ensuring zero leakage when the sealing pair contacts.

6, continue to turn the handwheel, the valve core and the seal seat contact. Achieve sealing. The drain valve body and bonnet are connected in a clip-type manner. The drain valve has a compact structure, the drain valve is easy to disassemble, the drain valve is easy to install, and the drain valve branch pipe is welded. The drain valve adopts a pressure self-tight seal structure. The seal ring of the drain valve is made of asbestos packing. The higher the pressure of the drain valve medium, the better the sealing performance. Sewage valve media flows from the branch pipe and drains downwards. The drain valve disc is of a piston type and is boronized. The drain valve has a long service life due to corrosion resistance and erosion resistance.

Nominal pressure	Test pressure Ps (MPa)			Applicable medium ()
Nominal pressure	Strength test	Water seal test	Hermetic seal test	Applicable medium ()
1.6	2.4	1.8	0.7	Water 250 Steam 425
2.5	3.8	2.8
4.0	6.0	4.4