  We propose new vertex operators, both the type I and the type II dual, of the
elliptic quantum toroidal algebra U_{t_1,t_2,p}(gl_{1,tor}) by combining
representations of U_{t_1,t_2,p}(gl_{1,tor}) and the notions of the elliptic
stable envelopes for the instanton moduli space M(n,r). The vertex operators
reproduce the shuffle product formula of the elliptic stable envelopes by their
composition. We also show that the vacuum expectation value of a composition of
the vertex operators gives a correct formula of the K-theoretic vertex function
for M(n,r). We then derive exchange relations among the vertex operators and
construct a L-operator satisfying the RLL=LLR^* relation with R and R^* being
elliptic dynamical instanton R-matrices defined as transition matrices of the
elliptic stable envelopes. Assuming a universal form of L, we define a
comultiplication \Delta in terms of it. It turns out that the new vertex
operators are intertwining operators of the U_{t_1,t_2,p}(gl_{1,tor})-modules
w.r.t \Delta.
