Triple eccentric butterfly valve operating torque

Date: Jun 08, 2022 342 views Source: VALTEC China Valve Manufacture CO.,LTD

VALTECCN butterfly valve manufacturers share the operating torque knowledge of triple eccentric butterfly valves: The operating torque of the triple eccentric butterfly valve is calculated based on normal temperature and clean medium. For high temperature, low temperature and non-clean media, the operating torque of the triple eccentric butterfly valve will increase.

During the opening and closing process of the triple eccentric butterfly valve, the required opening and closing force and opening and closing torque vary, and the maximum value is at the final moment of closing or the initial moment of opening. There are special requirements for the speed of the opening and closing process in some special conditions.

Torque calculation of triple eccentric butterfly valve

One-half the square of the diameter of the three-eccentric butterfly valve × 3.14 is the area of the valve plate, and then multiplied by the bearing pressure (that is, the working pressure of the three-eccentric butterfly valve) to obtain the static pressure on the shaft, multiplied by the friction coefficient (go to check In the table, the friction coefficient of steel is generally 0.1, and the friction coefficient of steel to rubber is 0.15), multiplied by the shaft diameter and divided by 1000 to obtain the torque number of the triple eccentric butterfly valve, the unit is N m, the electric device and the pneumatic actuator refer to the safety value Take 1.5 times the torque of the triple eccentric butterfly valve.

The torque value of triple eccentric butterfly valve is as follows (for reference only)

DN	NPS	0.6MPa	1.0MPa	1.6MPa	2.5MPa	4.0MPa	6.3MPa	285PSI	740PSI	1480PSI
50	2″	–	–	37	–	–	–	–	–	–
65	2 1/2″	29	35	60	82	106	142	69	123	213
80	3″	34	57	81	102	148	290	174	271	460
100	4″	61	102	141	180	259	526	250	395	834
125	5″	104	165	228	289	412	641	283	548	979
150	6″	178	250	450	564	790	1060	473	825	2938
200	8″	201	400	601	800	1201	1567	674	1503	3616
250	10″	353	518	956	1250	1860	2697	983	1887	5469
300	12″	635	992	1352	1711	2428	3147	2022	2508	11863
350	14″	819	1623	2234	2844	4067	4855	2520	4158	14123
400	16″	1047	1944	2842	3788	5533	6473	3175	6271	17061
450	18″	1451	2451	3452	4412	6454	–	4239	7864	21015
500	20″	2043	3285	4527	5769	8253	–	5531	10361	26551
600	24″	2779	5548	6018	9495	13443	–	6011	17559	38415
700	28″	–	–	6890	–	–	–	–	–	–
750	30″	3230	6723	7700	16552	–	–	12654	33105	–
800	32″	–	–	8760	–	–	–	–	52877	–
900	36″	5275	8474	9750	26438	–	–	18078	–	–
1000	40″	6915	11717	13560	–	–	–	24179	80219	–
1050	42″	8135	15253	16270	40110	34000	–	24875	–	–
1200	48″	12540	20563	22360	38900	41900	–	36155	–	–
1350	54″	18300	21806	29977	–	–	–	–	–	–
1400	56″	24650	–	34900	–	–	–	–	–	–
1500	60″	36440	36155	43397	–	–	–	–	–	–
1600	64″	40850	–	48600	–	–	–	–	–	–
1800	72″	–	–	–	–	–	–	–	–	–
2000	80″	–	–		–	–	–	–		–
2200	88″	–	–	–	–	–	–	–	–	–
2400	96″	–	–	–	–	–	–	–	–
2600	104″	–	–	–	–	–	–	–	–	–
2800	112″	–	–	–	–	–	–	–	–	–
3000	120″	–	–	–	–	–	–	–	–	—