This series of compound exhaust valve is suitable for installation at the water outlet of water pump or in the water supply and distribution pipeline, so as to eliminate a large amount of accumulated air in the pipeline. At the same time, the micro air accumulated at the higher place of the pipeline is discharged into the atmosphere to improve the use efficiency of the pipeline and water pump. In case of negative pressure in the pipe, this series of valve can quickly inhale the external air to avoid the pipeline breaking due to negative pressure The occurrence of tube phenomenon.

Among them, the carh waterproof hammer type exhaust valve is equipped with upper slow closing device on the basis of the original carx type, which is more suitable for the conditions of long-distance water delivery, large fluctuation of pipeline direction, easy to produce cut-off closure and water column separation.

Air closing pressure Mpa
Water closing pressure Mpa	≤0.02
Valve body test pressure Mpa	1.5Multiple nominal pressure
MPA sealing pressure test	1.1Multiple nominal pressure
Starting pressure of carh buffer MPa	≥0.1
Valve manufacturing standard	accord withCJ/T217-2005及 Enterprise standardQ/IDIK09-2011
Flange standard	accord withGB/T17241.6-2008

When water is injected into the water pipe, the piston or floating ball stays in the open position to exhaust a large amount of gas. When the air is exhausted, there is water in the valve and the floating ball is floated. When the piston or floating ball reaches the closed position, a large amount of exhaust is stopped. When the water in the pipe is normally transported, if a small amount of air accumulates in the valve to a certain extent, the water level in the valve will drop, and the floating ball will drop accordingly. At this time, a small amount of air will be discharged from the micro exhaust hole (integral type) or from the exhaust hole of automatic exhaust valve (split type). When the water pump stops, the water flow in the pipe is empty or negative pressure is generated in the pipe, the piston opens quickly to inhale air to ensure the safety of the pipeline.

When water is injected into the water pipe, the piston or floating ball stays in the open position to exhaust a large amount of gas. When the air is exhausted, there is water in the valve and the floating ball is floated. When the piston or floating ball reaches the closed position, a large amount of exhaust is stopped. When the water in the pipe is normally transported, if a small amount of air accumulates in the valve to a certain extent, the water level in the valve will drop, and the floating ball will drop accordingly. At this time, a small amount of air will be discharged from the micro exhaust hole (integral type) or from the exhaust hole of automatic exhaust valve (split type). When the water pump stops, the water flow in the pipe is empty or negative pressure is generated in the pipe, the piston opens quickly to inhale air to ensure the safety of the pipeline.

CARX+SCKV/CARHSee the attached figure for the working principle state diagram of the composite exhaust valve (see the back cover page).

Serial number	name	texture of material
1	valve body	Ductile iron（OT450-10）
2	Valve cover	Ductile iron（QT450-10）
3	O-ring	Nitrile rubber（NBR）
4	Piston frame	Aluminum bronze（ZCuAl10Fe3）
5	Sealing ring	Nitrile rubber（NBR）
6	piston	stainless steel（0Cr19Ni9
7	Floating ball	stainless steel（0Cr19Ni9）
8	Exhaust hood	Ductile iron（QT450-10）/carbon steel（Q235-A）
9	Automatic exhaust valve
10	Spring	stainless steel（1Cr18Ni9）
11	Throttle ring	polypropylene
12	Buffer cover	Ductile iron（QT450-10）
13	Inner cylinder of valve body	polypropylene

CARX/CARH系列复合式排气阀（清水用）

Pressure rating: PN1.0 / 1.6/2.5mpa
Nominal diameter: DN25 ～ dn80mm
Integral type: (DN25 is threaded type, the rest are flange type)

Dimensions:

Nominal diameter DN	Product code	PN(MPa)	D1	D2	t	n-d	H		A×B
							CARX	CARH
25	CARX-0025	1.0/1.6/2.5	ZG1"	/	/	/	～260	/	145×145
50	CARX（H）-0050	1.0/1.6/2.5	125	165	19	4-19	～320	～346	162×162
80	CARX（H）-0080	1.0/1.6/2.5	160	200	19	4-19	～365	～407	198×198

Pressure rating: PN1.0 / 1.6/2.5mpa
Nominal diameter: DN 100 ～ dn400mm
Split type: (for the description of automatic exhaust valve, please refer to relevant samples of our company)

Dimensions: Units：mm

Nominal diameterDN	Product code	PN (MPa)	D1	D2	t	n-d	H		H1		L	D3
							CARX	CARH	CARX	CARH
100	CARX（H）-0100	1.0/1.6	180	220	19	8	～413	～413	～398	～432	425	280
		2.5	190	235	19	8
150	CARX（H）-0150	1.0/1.6	240	285	19	8	～447	～460	～445	～511	505	356
		2.5	250	300	20	8
200	CARX（H）-0200	1.0	295	340	20	8	～563	～547	～546	～673	581	446
		1.6	295	340	20	12
		2.5	310	360	22	12
*250	CARX（H）-0250	1.0	350	395	22	12	～787	～766	～685	～900	880	500
		1.6	355	405	22	12
		2.5	370	425	24.5	12
300	CARX（H）-0300	1.0	400	445	24.5	12	～870	～850	～790	～1035	905	605
		1.6	410	460	24.5	12
		2.5	430	485	27.5	16
*400	CARX（H）-0400	1.0	515	565	24.5	16	～893	～906	～935	～1210	991	740
		1.6	525	580	28	16
		2.5	550	20	19	16

Note: * please consult the technical department of our company before ordering if you need PN2.5MPa.

How to select the diameter of composite exhaust valve:
1. Calculate the maximum exhaust or suction capacity at several higher points in the pipeline.
Calculated by gravity flow:
Where: s -------- slope s = TGA (a pipeline and horizontal inclination angle)
D -------- pipe diameter (mm)
Q -------- exhaust or suction capacity (m2 / h)
How to consider the maximum displacement:
A. When the air pressure difference between the inlet and outlet of the general composite exhaust valve reaches 4psi (i.e. 0.28kg/cm2), the air in the pipe can be finished before the piston is closed. Taking the calculated value of the above formula and 4psi as the reference point, the proper diameter of the exhaust valve can be obtained by checking the performance curve.
B. Generally, when the negative pressure in the pipe is more than 5psi (i.e. 0.35kg/cm2), it is possible to break the pipe. Taking the calculated value of the above formula and 5psi as the reference point and checking the performance curve chart, the appropriate diameter of the exhaust valve can be obtained.
Compare a and B, select the larger diameter, that is, the required exhaust valve diameter.
2. If the pipeline rupture caused by negative pressure is not considered, or the water flow rate in the pipe is between 1.2 and 2.4m/s, the appropriate diameter of exhaust valve can be selected according to the following table (or according to experience, the diameter of exhaust valve can be selected according to 1 / 8 pipe diameter of water delivery pipe).

Q（m³/h）	25	50	80	100	150	200	250	300	400
	0～350	220～740	650～1600	1300～3100	3000～7500	7300～15000	11000～21000	14000～31000	27000～59000

SCARISCARHI）系列污水复合式排气阀

summary:
In addition to the same technical parameters and indexes as carxicarh), considering the characteristics of sewage, the floating ball directly acts on the light spherical piston structure through the top plug, so that the water level of the valve is lowered and the floating impurities are far away from the sealing surface to prevent the dirt from depositing on the sealing surface of the piston.
Scarh water hammer sewage exhaust valve is equipped with upper slow closing device on the basis of the original scar sewage exhaust valve, which is more resistant to water and gas impact, not easy to damage the internals, prevent closing water hammer and make the exhaust function work normally.
Composition of sewage exhaust valve:

Pressure rating: PN1.0MPa Nominal diameter: dn50-200 mm Scar / scarh

Name and material of main parts:

Serial number	name	texture of material	Serial number	name	texture of material
1	valve body	Ductile iron（QT450-10）	8	Exhaust hood	Ductile iron（QT450-10）/carbon steel（Q235-A）
2	Valve cover	Ductile iron（QT450-10）/carbon steel	9	Floating ball	Assembly
	Piston frame	Cast stainless steel	10	Cushion	rubber
4	The seal is broken	NBR standard adhesive（NBR）	11	Guide sleeveB	stainless steel0Cr19Ni9
5	Limit plate	stainless steel0Cr19Ni9	12	Spring	stainless steel0Cr19Ni9
6	piston	stainless steel0Cr19Ni9	13	Throttle ring
7	Guide sleeveA	stainless stee0Cr19Ni9	14	Buffer cover	Ductile iron（QT450-10）

Dimensions

Nominal diameterDN	Product code	PN(MPa)	D1	D2	t	n-d	H		D
							CARX	CARH
50	SCAR(H)-0050	1.0	125	165	19	4-φ19	～528	～557	162×162
80	SCAR(H)-0080	1.0	160	200	19	4-φ19	～613	～655	198×198
100	SCAR(H)-0100	1.0	180	220	19	8-φ19	～698	～732	280
150	SCAR(H)-0150	1.0	240	285	19	4-φ23	～870	～929	356
200	SCAR(H)-0200	1.0	295	340	19	8-φ23	～1095	～1162	446

Buffer plug valve sckv
Double disc buffer valve DDHC

summary:
Sckv or DDHC series exhaust valve is mainly installed at the inlet of exhaust valve, which is used for sudden pressure and large flow impact during pipeline water supply, to prevent large amount of water spray of exhaust valve and effectively slow down water hammer. Especially for long-distance pipeline, large fluctuation and frequent start-up of water pump and installation of exhaust valve at the outlet of water pump need to be installed. Generally, it is recommended to be used together with the exhaust valve (carh and scarh series have been equipped with upper slow closing device, so it is not necessary to install this buffer valve. See the attached figure on the bottom page for the working principle status diagram).

Technical parameters:

Technical characteristics	characteristic parameter
Nominal diameter（mm	SCKV:DN25-DN400 DDHC:DN50-DN300
Nominal pressureMPa	PN1.0/1.6
Shell test pressureMPa	1.5PN
Pressure test standard	accord withGB/T1 3927-2008

Part name and material: Dimension:

Serial number	name	texture of material
1	Ductile iron	stainless steel
2	Bracket	Ductile iron
3	Cushion	Nitrile rubber
4	Floating bucket	stainless steel
5	valve body	Ductile iron
	Floating bucket support	Ductile iron

Nominal diameterDN	Product code	PN(MPa)	D1	D2	t	L	n-d
25	CARX（H）-0025	1.0/1.6/2.5	ZG1"	47	/	58	/
50	CARX（H）-0050	1.0/1.6/2.5	125	165	19	102	4-φ19
80	CARX（H）-0080	1.0/1.6/2.5	160	200	19	121	8-φ19
100	CARX（H）-0100	1.0/1.6	180	220	19	146	8-φ19
		2.5	190	235	19		8-φ23
150	CARX（H）-0150	1.0/1.6	240	285	19	228	8-φ23
		2.5	250	300	20		8-φ28
200	CARX（H）-0200	1.0	295	340	20	258	8-φ23
		1.6	295	340			12-φ23
		2.5	310	360	22		12-φ28
250	CARX（H）-0250	1.0	350	395	22	305	12-φ23
		1.6	355	405			12-φ28
		2.5	370	425	24.5		12-φ31
300	CARX（H）-0300	1.0	400	445	24.5	320	12-φ23
		1.6	410	460			12-φ28
		2.5	430	485	27.5		16-φ31
400	CARX（H）-0400	1.0	515	565	24.5	457	16-φ28
		1.6	525	580	28		16-φ31
		2.5	550	20	32		16-φ37

Dimensions: Units：mm

Nominal diameterDN	Product code	L	L1	D1	D2	D
50	DDHC-0050	54	6	65	48	105
65	DDHC-0065	60	10	78	57	124
80	DDHC-0080	67	10	91	70	137
100	DDHC-0100	67	20	117	91	162.5
125	DDHC-0125	83	25	144	113	192.5
150	DDHC-0150	95	32	171	135	218
200	DDHC-0200	127	40	222	176	273
250	DDHC-0250	140	59	276	222	328
300	DDHC-0300	181	64	327	270	379