Explosion Proof Pneumatic Three-way Ball Valve_Meisonilan Valves (Suzhou) Co., Ltd.

Pneumatic three-way flange ball valve is suitable for switching the flow direction of media and diverting or mixing fluids in pipeline systems such as water supply, petrochemical, metallurgical, mining, textile, energy, papermaking, food, steel, etc.

Valve Body

Valve Body Type	Three-way Cast Ball Valve
Nominal Diameter	DN15 - 200mm
Nominal Pressure	Chinese Standard PN1.6, 2.5, 4.0, 6.4 MPa; American Standard ANSI 150, 300LB; Japanese Standard JIS 10, 20, 30K
Flange Standard	JIS, ANSI, GB, JB, HG, etc.
Connection Type	Flange Type, Threaded Type (Suitable for 1/2" - 2")
Bonnet Type	Integral Type
Gland Type	Press Plate Compression Type
Sealing Packing	V-type PTFE Packing, Impregnated PTFE Packing, Asbestos Braided Packing, Flexible Graphite

Purpose and Structure:

L-type three-way ball valves are used for changing the flow direction of the medium, enabling the connection of two mutually perpendicular channels.
T-type three-way ball valves are used for medium diversion, confluence, and flow direction switching. The T-shaped channel can connect three channels or connect two of them. Three-way ball valves generally adopt a two-seat structure, and a four-seat structure can also be adopted according to user requirements.

Valve Internals

Spool Type	O-type Ball Spool
Flow Characteristic	Quick-Opening Characteristic

Actuator

Actuator Model	GT, SR, ST, AT, AW Series Single and Double Acting Pneumatic Actuators
Supply Pressure	0.4 - 0.7MPa
Air Source Interface	G1/4", G1/8", G3/8", G1/2"
Ambient Temperature	-20 - +90°C
Action Type	Single Acting Actuator: Air-Close Type (B) - Valve Position Opens (FO) when Air is Lost; Air-Open Type (K) - Valve Position Closes (FC) when Air is Lost. Double Acting Actuator: Air-Close Type (B) - Valve Position Remains (FL) when Air is Lost; Air-Open Type (K) - Valve Position Remains (FL) when Air is Lost.
Available Accessories	Positioner, Solenoid Valve, Air Filter Regulator, Position Holding Valve, Travel Switch, Valve Position Transmitter, Handwheel Mechanism, etc.

Dimensions of Pneumatic Three-way Ball Valve

Model ZSHO-3
Diameter DN		L	L1	D	K	D1	n-Φd	b	f	H	W
mm	in	L	L1	D	K	D1	n-Φd	b	f	H	W
25	1″	200	100	115	85	65	4-Φ14	16	2	193	140
32	1 1/4″	220	100	140	100	76	4-Φ18	18	2	212	164
40	1 1/2″	250	125	150	110	84	4-Φ18	18	2	230	164
50	2″	260	130	165	125	99	4-Φ18	20	3	268	190
65	2 1/2″	300	150	185	145	118	4-Φ18	20	3	293	210
80	3″	320	160	200	160	132	8-Φ18	20	3	325	247
100	4″	370	185	220	180	156	8-Φ18	22	3	380	276
125	5″	430	215	250	210	184	8-Φ18	22	3	468	348
150	6″	480	240	285	240	211	8-Φ23	24	3	510	378
200	8″	550	275	340	295	256	12-Φ23	24	3	655	432

Valve Installation:
(1) Before installation, check that the product model, tag number, and specifications match the requirements. Inspect the entire valve for missing or loose parts.
(2) Prior to installation, clean the pipeline. Ensure there is sufficient straight pipe section at the valve inlet and install a filter. When connecting the valve body to the pipeline flanges, ensure coaxiality.
(3) Thoroughly clean the pipeline before installing the valve.
(4) The installation site should ensure the safety of personnel and equipment, facilitating operation, disassembly, and maintenance.
(5) The valve should be installed vertically upright on horizontal pipelines. If necessary, it can be installed at an angle, but horizontal installation should be avoided. For occasions with heavy valve weight or vibration, use a support frame.
(6) The medium flow direction must align with the arrow on the valve body. The air supply should be dry and oil-free. The valve should be used in environments with temperatures ranging from -20℃ to 55℃.

Valve Maintenance:
(1) Cleaning the Valve: For general media, cleaning with water is sufficient. For media harmful to health, first understand their properties and then select an appropriate cleaning method.
(2) Disassembly: Remove rust from exposed rusted parts first. Before derusting, protect the machined surfaces of precision parts such as the valve seat, valve plug, valve stem, and push rod. Use special tools when disassembling the valve seat.
(3) Valve Seat: Minor rust or wear on the sealing surface can be repaired by machining. If damage is severe, replace the seat. However, both repaired and replaced hard sealing surfaces must be lapped.
(4) Valve Stem: If the surface is damaged, it must be replaced.
(5) Damage to Push Rod, Guide, and Sealing Surfaces: Reverse-acting actuators must be replaced; direct-acting actuators can be reused after proper repair.
(6) Compression Spring: If there are cracks or other defects affecting strength, replace it immediately.
(7) Wear Parts: Packing, gaskets, and O-rings must be replaced entirely during each maintenance. Check the valve plug and diaphragm for cracks, aging, or corrosion that may cause future failures. Decide whether to replace them based on inspection results, but the diaphragm service life should not exceed 2-3 years.
(8) When reassembling the valve, ensure alignment. Tighten bolts diagonally and lubricate sliding parts. After reassembly, debug the valve according to the factory test items and methods. During this period, accurately adjust the packing compression force and the valve plug closing position.

When placing an order, please fill in the Specification Sheet or specify the following information:

If the model has not been selected before ordering, please provide us with the operating parameters:
(1) Nominal diameter DN (mm);
(2) Nominal pressure (MPa or bar);
(3) Fluid properties (including medium temperature, viscosity, or acidity/alkalinity);
(4) Pressure before and after the valve (pressure differential);
(5) Requirements for flow characteristics;
(6) Materials of valve body and valve core;
(7) Connection type;
(8) Driving method (provide air supply pressure, driving voltage);
(9) Supporting accessories (for pneumatic valves, it is recommended that users install an air filter triplet and a 2-position 5-way solenoid valve);
(10) On-site working conditions.
If the product model of our company has been selected by the design unit, please order directly from our production department according to the model;
When the application occasion is very important or the pipeline is relatively complex, please provide the design drawings and detailed parameters as much as possible, and our experts will review and check them for you.