gate valves , gate valve ; size: 10 inch nb , rating 1500 lbs as per api 600 with back seat and manual gear box; material of construction: body & bonnet-a-216 gr wcb; body seat rings & back seat -a182 gr . f6a stellited/cs + st-6/a-105n plus hf , wedge- a182 gr . f6a stellited/cs +st-6/a-105n plus hf; stem- a-182 gr f6a/ a-479- 410-2; gland flange-a105; gland bushing-a182 f304/a479-410; gland studs & ------------------------------------------------as per nit , gate valve ; size: 4 inch nb , rating 2500 lbs as per api 600 with back seat; material of construction: body& bonnet-a-217 gr wc-9; body seat rings & back seat -a182 gr . f6a stellited/a-182 gr f22 plus hf/a-217 gr wc-9 st-6 , wedge- a182 gr . f6a stellited/a-182 gr f22 plushf/a-217 gr wc-9 st-6; stem- a-479- 410-2/a182 gr f6a; gland flange-a-182 gr f-22; gland bushing-a182 -------------------------as per nit , gate valve ; size: 10 inch nb , rating 2500 lbs as per api 600 with back seat and manual gear box; material of construction: body & bonnet-a-217 gr wc-9; body seatrings & back seat -a182 gr . f6a stellited/a-182 gr f22 plus hf/a-217 gr wc-9 st-6 , wedge- a182 gr . f6a-----------------------a s per nit , gate valve ; size: 12 inch nb , rating 2500 lbs as per api 600 with back seat and manual gear box; material of construction: body & bonnet-a-217 gr wc-9; body seatrings & back seat -a182 gr . f6a stellited/a-182 gr f22 plus hf/a-217 gr wc-9 st-6 , wedge- a182 gr . f6a--------------------------as per nit , gate valve -motorized operated valve - mov , motorized actuator make should be of auma , rotorak , biffi& limitorqu only , specifications for motorizedaccuator shall be as per attached annexure-i; valve should be with gear box and motorized accuator , size: 10 inch nb , rating 2500 lbs as per api 600 with back seat ;