C4 steel gate valves (gate valve) of the opening and closing is
ram, ram movement direction and perpendicular to the direction of
flow of C4 steel gate valves can only be fully open and close, not
to adjust and throttling. C4 steel gate valve gate direction
perpendicular to the direction of flow and the C4 steel gate valves
can only be fully open and close, not to adjust and throttling.
Sealing face has two gate, two of the most commonly used mode gate
valve sealing surface form a wedge, the wedge Angle vary with the
valve parameters. Classification C4 steel gate drive mode: manual
gate valves, pneumatic gate, electric gate valves.
Structure classification of C4 steel gate structure classification,
there are many different ways adopted by the sealing element is the
main difference between different structure forms, according to the
structure of the sealing element, often the gate valve is divided
into several different types, and is the most common form of
parallel type gate valve gate and deed; According to the structure
of the valve stem can be divided into rising stem gate valves and
non-rising stem gate valves
C4 steel gate valve installation points
1, installation location, altitude, direction must comply with the
design requirements of imports and exports, connection should be
2, all kinds of manual valves installed on the thermal insulation
pipe, handle shall not down.
3, a visual inspection must be conducted before installation of
valve, the valve nameplate should be consistent with existing
national standards "universal signal valve" GB 12220. For the
working pressure is greater than 1.0 MPa and valve with the
function of cutting off on ZhuGanGuan, strength and strict
performance test should be done before the installation, qualified
rear must use.
Strength test, the test pressure is 1.5 times the nominal pressure,
duration of not less than 5 min, shell and packing shall be no
leakage of valve shall be qualified. Leak test, the test pressure
is 1.1 times the nominal pressure; The duration of the test
pressure in the test should comply with the standard of GB 50243
requirements, qualified for damper seal face no leakage.
The working principle of C4 steel gate:
According to the sealing surface configuration can be divided into
wedge type gate valve and parallel sluice gate valve gate, wedge
gate valve gate can be divided into: single gate type, double disc
and flexible disc; Parallel slide gate valve can be divided into
single ram and double ram. According to the threads of the valve
stem position, can be divided into rising stem gate valves and dark
bar gate valve two kinds.
C4 steel gate is closed:
Sealing surface can only rely on medium pressure to seal, that is,
to rely on medium pressure to press the sealing face of gate to the
other side of the seat to ensure sealing face seal, this is the
seal. Most is adopt compulsory seal gate valve, the valve is
closed, to rely on outside force forced the ram pressure to the
seat, to ensure the sealing surface sealing.
The gate valve gate, as a straight line with the stem, called
lifting lever gate valve (also called rising stem gate valves).
Usually in lifting lever on the trapezoidal thread, through the
valve at the top of the nut and guide groove on the valve body, the
rotation movement into linear motion, which is the operating torque
thrust into operation.
Open the valve
When the gate hoisting height is equal to valve size 1:1 times,
fluid channels open completely, but at runtime, the position cannot
be monitored. Actual use, is the stem apex as a sign, that is fixed
position, as its full open position. To consider locking phenomenon
in a temperature change, usually in the open to the vertex
positions, pour 1/2-1 ring back, as the full open position of the
valve. Valve in full open position, therefore, according to the
location of the damper (namely travel > to determine.
Some C4 steel gate valve, the valve stem nut located in ram, the
hand wheel rotation drive the valve rod rotation, and make the
disc, the valve is called rotating lever gate or non-rising stem
A, the manual valve working principle:
Turn the handwheel by hand wheel and screw thread of the valve stem
of the advance and retreat, lifting or lowering the valve plate
connected to the valve stem, reach the role of opening and closing
C4 steel gate has the following advantages:
Fluid resistance is small. Open and close more effort. Medium flow
direction is not restricted, disturbed flow, reduce the pressure.
Shorter form, simple structure, good manufacturing technology, wide