According to the international standards of several commonly used, the size of the valve diameter and wall thickness.These standards and sizes shown in the following table.Install a plumbing system, in order to correctly choose consistent international pipeline interface standard is very important, so as to ensure the process piping system conform to the requirements of the health level.
If the valve interface standard and system pipeline and system interface standards are in consistent, is easy to cause deformation within the interface or the steps, there is no guarantee that the emptying function of the valve.
Butt welding is the most common way of connection interface, without any other materials. Usually includes automatic welding and argon arc welding welding way,besides this way, we can also provide other way of connection.

Manual diaphragm valve Pneumatic diaphragm valve

Butt welding standard							ISO 1127	DIN 11850		DIN series selection	ASTM 269                   ASME BPE		SMS 3008	JIS G3447
								Series 1	Series 2
DN	NPS	MA	L(min)	L1	h1	h2	φd×s	φd×s	φd×s	φd×s	φd	s	φd×s	φd×s
10	3/8	10	25	72	9	9	17.2×1.6	12×1.0	13×1.5	—	—	—	—	—
15	1/2	20	25	120	13	16	21.3×1.6	18×1.0	19×1.5	—	12.7	1.65	—	—
20	3/4	20	25	120	16	16	26.9×1.6	22×1.0	22×1.5	—	19.05	1.65	—	—
25	1	25	25	120	19	19	33.7×2.0	28×1.0	29×1.5	—	25.4	1.65	25.0×1.2	25.4×1.2
32	1 1/4	40	25	153	24	26	42.4×2.0	34×1.0	35×1.5	—	31.75	1.65	33.7×1.2	31.8×1.2
40	1 1/2	40	25	153	24	26	48.3×2.0	40×1.0	41×1.5	—	38.1	1.65	38.0×1.2	38.1×1.2
50	2	50	32	173	32	32	60.3×2.0	52×1.0	53×1.5	—	50.8	1.65	51.0×1.2	50.8×1.5
65	2 1/2	50	32	173	32	32	—	—	—	—	63.5	1.65	63.5×1.6	63.5×2.0
65	2 1/2	80	47	216	47	47	76.1×2.0	—	70×2.0	—	63.5	1.65	63.5×1.6	63.5×2.0
80	3	80	47	254	47	47	88.9×2.3	—	85×2.0	—	76.2	1.65	76.1×1.6	76.3×2.0

MA said the size of the diaphragm
According to the requirements, can also provide other standard docking
The above table shown in bold in the size of the preferred specification